With the hose not connected to the RV, drain it, then pour the bleach into the hose while holding it so the bleach doesn't run out. Connect it to the tank fill, then use city water pressure to push it into the tank. Do it as many times as you need to get the correct amount of bleach into your tank.
If you have a water filter, remove it. It may have charcoal which would absorb the bleach.
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