Boiled bread yeast for nutrient, sulphite free dried figs/raisins are also a mineral rich nutrient and body builder, same with banana with skin, green skin of papaya will provide a natural pectic enzyme called papain (pineapple and grapefruit apparently also provide though I have not tried), epsom salts as a nutrient, sulphite free molasses is a great nutrient(1 tsp per gallon). Have used everything listed.
I do have friends in AU/NZ who use marmite, vegemite as a yeast nutrient. Have also talked to many old timers who tossed the heel of homemade bread in as a nutrient, meets definition of dead yeast.