Starting this Tides of Terraria version, ice types slow food decay by 20% per ice pal in your team. In addition to that, Munchill has his own food decay ability and is an ice type on top.
At ability level 1 (so, no condensation) his ability slows food spoilage rate by 30% which when you factor in him being an ice type puts food decay at -50% speed. At full condensation, his ability slows food decay by 80% which should be sufficient to stop food decay entirely just by having him on your team (80% from ability + 20% from 1 ice type in team)
Admittedly I haven't tested the above scenario yet, but I have munchill at level 2 ability (42% slower food decay) and with him, Frostallion and Bastigor

