How do i stop eating? Not trying to lose weight? Just want to munch on something all day.?

I have access to food all day. I babysit in my home. I am the right size for my body weight, I work out and I have the munchies all the time. I try drinking lots of water, then I got to pee all the time. Help. What do you do so you don't eat all the time. Is there something that keeps you full for longer, without getting hungry every two hours or less?