I use my water bottles to market my real estate business in my subdivision's community events such as golf tournament, 4th of July parade, Easter, Girl's night out and Christmas. I also use them at home gatherings with friends to remind them I'm in the business of selling homes. Most recently contacted a restaurant & they agreed to co-advertise with me, I put their logo & website & removed my photo but kept my other info. So I give them the water bottles for free & they advertise for me.
Get the waterproof material if you'd like to chill water bottle labels.