In the Frostford quest line, if you do everything right you have to bring 500 supplies to Zoe in the forest clearing... How do you pull this off? I really don't want to spend 60 plus hours to mutate one slave over and over again to increase carry capacity for just one mission.

You don't need the items on your travel party just got to own them. Thought it was food but yeah as long as you own them just go there.

Indeed, that quest is exempt from the local inventory rule because people felt it was too inconvenient, and it was definitely food not supplies. Also there is a bag accessory which is superior to strength for increasing carry capacity.

What counts as food? Supplies or Provisions? I'm guessing Provisions. Or, is their some item that counts as a "Food" they are looking for?

The dummy item you buy in the store is called "Provisions", but it is instantly converted to the mansion resource "Food" when bought. Thus it is not possible to have either in your inventory as an item and it is available everywhere you go.

Okay, sorry... I was trying to apply literal thinking to it... I was going form town to town looking for "Food"... I feel like a moron now.