The sloshing never bothers anything. In fact it is good for the black tank to have a little water in it to slosh around.
As far as how much water you need?, well depend on how long you plan to stay. If it is just 1 night with shower for 2, 1/2 a tank would be plenty.
Bringing a jug or water from town now and then I have spent 3 weeks dry camping on a tank of water.
rick
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