Bleach in water fresh water tank

After draining the bleach out of my fresh water tank, I would put a small bottle or white vinegar in the tank and fill with water and let set for 4 hours or over night. Then drain and refill with just water and drain again a couple of times. This will dilute any bleach residue left on the inside of the tank. If I'm de-winterizing, I will run the bleach through the lines from the fresh water tank (bypass hot water heater) to flush all the anit-freeze out of the supply lines. If I do that, I will also run the vinegar solution through the supply lines until the bleach smell is gone and then flush the lines with fresh water after rinsing the vinegar from the fresh water tank. Now your whole system is sanitized.

Enjoy your water!