What do you do to make positive you remember your water bottle? I commute 11 miles to work, and at least once a month, at about mile 2, I'll look down and notice I left my water bottle on the counter at home!

What tricks do you have to make sure this doesn't happen to you?
I'm not a commuter, but I believe in putting something that must not be forgotten next to something that might be forgotten.

For instance, I would put my bike gloves on top of my water bottles.

(I do the same thing when I have people over to visit. If there's something in the fridge that I want them to take home, I put their car keys in the fridge on top of the container.)