I'm starting to bring my turtles outside in my backyard for about an hour or two for them to get some natural sun. I always give them some water and a couple rocks for them to bask in. But if I do this, is it okay to use tap water? My tap water is actually "drinkable" but just in case, we actually usually use the drinking water faucet instead. It's softened, too, so I'm sure it's mostly safe. And I wanted to use tap water because it's more convenient since it's only temporary and also, I can actually use water that's a little on the warmer side, instead of the cold drinking water.
I live in Arizona so right now, the weather's okay, not too hot, not cold. So should I give them room temp. water or colder or hotter?

I've got lots of questions, I know. lol ;3 Thanks!