The Prestidigitation cantrip still allows you to warm and flavour food, right? So you just make your rations the most godawful combination of mystery-meat jerky and dried grain etc., then have one low-level wizard for each company to warm and flavour them into something vaguely palatable.
Call them MREs - Meal Ready to Enchant.
Does this require brown sauce or mayonnaise as a material component?