We used to just use public drinking fountains. Or paper cups at the office water cooler. And kids drank out of water fountains in parks, or out of random garden hoses they found.
Yesterday I saw a kid with a fancy Nalgene... at church!
I have a pill that I take which has dry cough as a side-effect, and even I don't bring a water bottle to church. The kid's not going to shrivel up and blow away because he can't have a sip of water for 45 minutes.