With perishable food, budgeting to have a little spare and then giving away any excess seems the most sensible. Better for it to find a good home immediately than potentially go to waste, so long as best attempts are made to not let the amount of excess get… excessive.
Long-lasting food like cans could be stored for another game, if there was space to transport and store it. Otherwise likewise given away - it’s not likely to be a major budget drain.
Could you explain a bit more about the non-food perishables mentioned?
Contact lenses - can they only ever be worn by one person? Do they expire? Could they be stored by NZLARPS for use by that one person as crew at future larps?
Pull-off latex masks - never heard of these. Same questions as for the contact lenses I guess.
I guess what I mostly wonder is something is so perishable, who would want to buy it? Whereas if it’s not so perishable, could it not be used in another game if one was coming soon (even if it was a different campaign or a one-off)?