Why are you worried about the conductivity of the water? Presumably, you wont be turning it on while its wet, so removing the battery, any clock batteries, and

Why are you worried about the conductivity of the water? Presumably, you wont be turning it on while its wet, so removing the battery, any clock batteries, and discharging capacitors (I'll admit, I don't know how to do that or if its possible) should make it fine to submerge in anything.