ELECTROCUTION! can someone help out a layman writer?

[stampystampy]

odd question here, but any help would be treasured!

can a quantity of activated D alkaline batteries tossed into a swimming pool create enough of a charge to electrocute a person? a small animal?

does chlorine (or another chemical) facilitate the conductivity of electricity?

if i'm trying to electrocute someone in a pool (no worries, this is fiction), are my only options a lightning bolt from mother nature or an electrical appliance plugged in somewhere nearby?

THANKS!