Water Bottles

I've been thinking about water bottles. In the past I haven't had kids bring water bottles to school, but I think I'm going to change that. So here's the plan... students may bring a clear plastic water bottle from home, I'd like for it to be a smaller bottle so no larger than a 12 oz, with some kind of locking straw device to drink from, that should help to prevent spilling. Students will only be allowed to drink plain water, and we'll try to dump them out daily to prevent science experiments from growing in them. If a child is having a problem with their water bottle, it will be sent home.