by Jamie Martin, Brewmaster, Dells Brewing Co.
Dry yeast backup: If something happens to your yeast it can take days to get a fresh pitch.
Back up oxygen: Not just an extra tank, but one you never use unless it’s an emergency.
Hops: Dry hopping can “hide” some minor brewing sins.
Spices: Dry spicing can “hide” some minor brewing sins.
Support system: I also recommend having the phone number and email of every brewer in a hundred mile radius.