At first, open a new file in Blender. The file opens with a default cube that is by default selected. The view is in User Perspective mode.
You need to change the view to User Orthographic mode. For that, go to the View menu>View Persp/Ortho. You can also press Numpad 5 from your keyboard to get User Ortho view.
Now get the Front Ortho view by pressing Numpad 1 from your keyboard.
At the 3D view port set the object interaction mode as edit mode.
Press Delete button from your keypad to delete all the vertices of the cube.
Now, In the window there is a mesh object called cube, it has a centre point but no vertices.
In the object properties change the name of the object to "Bottle".
Now, to save the file press Ctrl-S from your keypad. You can also go to the File menu>Save.
Save the file as "Bottle.blend". From now, keep saving the file after each step by pressing Shift-Ctrl-S from your keyboard.
Placing the Reference Image
To create the profile of the bottle, you will need a reference image. I have used an image of a bottle, that I have created in GIMP. The current important procedure is placing the reference image. For that, click N from your keyboard to bring out the Properties panel. You can also open the Properties panel by clicking the "+" sign adjacent to the Outliner panel.
Scroll down to the Background Images panel, click the checkbox next to it and click on Add Image. Click Open to browse and select the reference image.
Select your reference image and click Open Image. As I have said earlier, I have used an image of a bottle here(blue vase.jpg), which I have created in GIMP.
The image is by default set for all the views(Front, Left, Right, Top, Bottom and Back). In the Background Images panel, select Front in Image Axis. Now you can view this image in the front view only.
In this step, you are going to create the profile of the bottle. At first, zoom in by holding down Ctrl and dragging MMB(Middle Mouse Button). Now, with pressing the Alt key hold down your Ctrl key and left-click with your mouse to create the first vertex as shown below. With the vertex selected, move your cursor to down and holding down your Alt and Ctrl key, left-click to create the second vertex as shown below. Again hold down the Alt key and Ctrl key, to create a third vertex just below the last. Thus, continue creating new vertices and draw the profile of the bottle.
You can do repositioning of the vertices to shape the profile accurately. For that, select the desired vertex by clicking the RMB(Right Mouse Button). Then, move it along the X axis.
Now, select the mesh representing the profile of the bottle in Edit Mode by pressing A once from your keypad. Move it along the X axis as shown in the image below. In this stage, you can hide the reference image by unclicking the Background Image checkbox.
This is the step where you are going to apply the Spin Tool. Go to Top view by pressing Numpad 7. Then, with the profile selected in Edit Mode, click the Spin button. You will get an object like below. That is because the cursor is not in the centre of the rotation.
Press Ctrl-Z from your keyboard. To make sure the cursor is in the centre, go to the Mesh menu>Snap>Cursor to Centre.
Now, click the Spin button again. The result is a 90-degree turn.
Enter 360 degree as Angle to get a full turn.
Being a low poly mesh the profile is duplicated nine times. To make it higher poly model increase the steps. Set the steps to 24 to duplicate the profile twenty-four times.
The final duplication is on the top of the first profile. So you need to remove doubles. Zoom in by holding down Ctrl key from your keyboard and dragging the MMB(Middle Mouse Button). Now, press A on your keyboard and select the object in Edit Mode. Then click Remove Doubles. In this stage, you can hide the reference image by unclicking the Background Image checkbox. Or you can do that just after creating the profile of the bottle.
The next thing to do is to fill the bottom hole of the bottle. Dragging with the middle mouse button rotate the view. Select all the vertices to merge by clicking left mouse button while holding down Shift key from your keyboard. Then press Alt-M from your keyboard to merge the selected vertices at the centre.
You can see the selected vertices merged at the centre.
Go to front view by pressing Numpad 1 from your keyboard. Go into Object Mode to put the Shading to Smooth.
Now you are going to insert a new edge loop as shown in the image by clicking Ctrl-R from your keyboard. Do it in the Edit Mode.
Now you are going to apply the Subdivision Surface of Modifiers. Go to Object Mode. Click Modifiers button, click Add Modifier>Subdivision Surface.
Change the number of subdivisions to 2 and Render to 2.
Dragging with the middle mouse button rotate the view. Apply the Solidify option of Modifiers under Add Modifier to thicken the bottle.
Change the level of Thickness to 0.2. Press Enter from your keyboard.
Now, go to Front view by pressing Numpad 1 from your keyboard. Then, scale down the bottle by holding down S from your keyboard. To do that, Tap S once on your keyboard to enter Scale mode. Scale the Bottle by moving the mouse. Click LMB(Left Mouse Button) to accept changes.
Press Shift-A from your keypad and select mesh object plane.
By holding down G from your keyboard place the plane under the bottle by moving the mouse. LMB(Left Mouse Button) click to accept changes. Press S once on your keyboard to enter Scale mode. Scale the plane to make it bigger by moving the mouse. Click LMB(Left Mouse Button) to accept the change.This plane is going to be the floor of the bottle.
Go to the drop down menu and select Cycles Render.
Add a material to the plane.
Now, click open the Material Surface and from the drop down menu select Diffuse BSDF.
Make a duplicate of the existing plane by pressing Shift-D from your keyboard. To rotate the duplicate plane press R once on your keyboard. Then rotate about 90 degrees along the Y axis. Click the LMB(Left Mouse Button) to accept the change. Or you can enter 90 degrees as Angle. This second plane is going to be your lamp.
To turn this plane into a lamp, go to Front view by pressing Numpad 1 from your keyboard. Move the plane along Y axis by holding down G on your keyboard With the plane selected in Object Mode. Click open the Material Surface and from the drop down menu select Emission.
Turn the strength of Emission up to 10.
Go to Top view by pressing Numpad 7 from your keyboard. Move the lamp plane by holding down G on your keyboard as shown in the image below.
Press N with the pointer in the 3D View to access the Properties side panel. Then, under the View tab, click on the Lock Camera to View option to activate it. Make sure you are in Camera view by pressing Numpad 0 from your keyboard. You will notice that the camera limits become red, indicating that your camera is locked to the view. You can now zoom, orbit, and pan the same way you do in other views, and the camera adjusts accordingly.
Now you are going to add Glass Material to the bottle. Go to Front view by pressing Numpad 1 from your keyboard. With the bottle selected in Object Mode, add a new material. Click open the Material Surface and from the drop down menu select Glass BSDF.
Go to Camera view by pressing 0 from your keyboard. Click the world button and change the color to black.
Now, click the material button and change the color of glass to light blue.
Now,render the active scene by pressing F12 from your keyboard. You can also click the render button. But the rendered image is not clear. The glass bottle is full of grain or noise.
To fix this, change values of rendering sample under Render > Sampling. The higher value you put there, the less grain you will get. Change the value to 2000 and render the scene again. Now, the rendered image is clearer with less grain.
The final output.