I just completed this. I thought it was so good that I would put it up now.
There was no drawing involved in this. Just making shapes and gradients. I didn't even start with any kind of sketch, I just looked at my water bottle, and build this.
Illustrator is an amazing program because I can do stuff that's very fun and cartoony, but it's also a great tool for creating hyper-realistic images. I could use a 3d program, but I think this way gives it a nice illustrated feel to it, and plus this was an assignment for my Illustrator class.