i am currently gearing up to make my first batch of wine, elderberry wine. i have a 5 gallon food grade bucket to cold soak berries and to begin process then was going to move to a 5 gallon carboy, but i will be making about 3 gallons of wine. so do i need to have a smaller bucket and carboy? i have read that you want your wine about an inch below the stopper/airlock of carboy is this correct? need some details thanks!!