There's no punishment, and nothing in your camp gets damaged. Camp damage only comes from missing your daily check-ins.
Each week is scored against that week's target, not your ideal, so being above your ideal early on is expected.
Coins work on a sliding scale, not all-or-nothing. If you go over the week's target but stay below your usual, you still earn a good number of coins. Coins only drop towards zero if you drink well over your usual amount.
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