First get back on the weight road, then drink a pint of water and weigh-in again, which should drop your measured % body fat. Oh, the games we play.
This is why I want an ‘uncle!’ button, so that I can hard-commit to a derailment on days when I know I’m unlikely to scramble back on the road in an orthodox manner. Short-circuits the potential games and can be executed in a single moment of lucidity.