Sailing things right

The season is over, marina prices are already twice as low, so I'm going to marina for resupply.
Weather forecast for the next weekend is unstable but for sure the will be no fair winds, so here I am.

Recent discovery: by docs, both of my water tanks are 150l each. But it turned out that the rear one is at least 50l bigger since I'm using it for a whole month already and only now it started showing low levels on a gauge.
Previous month I've been using the front one and it lasted three weeks.