I use zip lock baggies with the day written on and eventually added the date. I added a date because the sitter called me and said I did not leave enough food, one day short. This puzzled me until I got home. I labelled the bags for every few days i.e. Mon, Wed, Sat, Tue, etc. Well one had Sun which was for the next week and they fed 2 days in a row (Sat/Sun) it was no big deal. So now i put both on just to be clear.I got my fish food prepared for my surgery next week as I won't be able to use my left arm for a while. I also do this when I go away so my tank sitter only has to dump one in the tank every day.
These are film containers. For anyone under 50, film was used in cameras before cell phones. It is like Scotch Tape but pictures stick to it.
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Glue them back on with bathtub calk. They love that.Wish I could keep urchins in this tank. They live a month or two and then drop spines.