You need a tool of some kind to break open the ice holes inside fishing huts (I first thought these might just 'melt' if you lit a stove, but no). You can use a knife or hatchet, but these get damaged by the ice. If you have one, use a pry bar to break open ice holes.
Don't eat any poor quality food (i.e. with a low % score) unless you have some antibiotics on you. I ate a sketchy energy bar (around 22%) and got food poisoning. I thought I could sleep it off, but died. You need to take an antibiotic (or drink Reishi tea) and then have 6 to 10 hours sleep for a cure.
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