[Peggysu]

I use filtered water for my piggies because where I live we have really hard water. I would wash it and refill it everyday with room temperature water. Also some pigs don't drink a lot of water especially if they get veggies that have just been washed. Mine don't drink much and I change it everyday regardless of how full the bottle is.

Have you tried glass water bottles? I hear those are great and you can boil them to disinfect.