Of course it wouldn't. There isn't "history", so to speak, attached to water. Even if someone peed in a pool, water molecules move so frequently it would lose the "memory" almost immediately.

[A pause.]

But you are picking up the basics of shielding, despite the fact you thought you wouldn't be. I should be grateful that I'd been working with my brother on developing a training regimen for a child or I fear I'd be going over your head.