Cost for 1 gallon:
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3-1/2 lb. bananas * ~$.50/lb = $1.75
1 lb. chopped golden raisins * ~$3.00 (sometimes less) = $3.00
2 lb. granulated sugar * ~$.75/lb = $1.50
1 gallon water * ~$.75 = $0.75
wine yeast * ~$1 (on special at LHBS) = $1.00
Total cost of one-time materials, 1st gallon: ~$8.00
6 gallon cost: ~$36 (~$31.50 - water)
Winemaking essentials:
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1-1/4 tsp. acid blend
1 tsp. pectic enzyme
1/4 tsp. grape tannin
yeast nutrient
Using tapwater and cheaper yeast can really drop the price. The golden raisins are where the cost is at, though... so if you could source those a bit cheaper you'd be good to go.
Two years, and about $1.60 a bottle you'd have a tasty little wine.
