Bath toys and trying to drink bath water

Now that I’m older, I’m much more active all the time, including when taking a bath. Instead of just being bathed, I want to play as well. So I get to sit down and play with my bath toys. The problem is that I when I sit down, I am very close to the surface of the water and I try to drink it. I know, ewwww, but how I am I supposed to know? I thought water is for drinking. I don’t the difference between clean water and dirty water.