Did you even stop to think about how dirty that water might be?

[... well, it probably isn't since it just now came into existence, but still. Who just drinks water straight from a lake? There are so many germs in there? Animals and people jumping in it? It's probably super gross?? Eugh, he feels sick just thinking about it...]

If you're going to act like an animal, why don't you go eat some grass while you're at it? Disgusting.