I'm not a doctor. You need to control the alcohol content. If you don't use too much sugar and don't let it ferment too long (more than 24-48 hrs), it should be a safe amount of alcohol.
Any potable supplyIn reality, although the water heater can use a supply from any potable source, it is always better to have its' inlet connected to a water tank. There are a number of advantages-1....
If water is only drawn from the cold faucet, then no, the water heater is not involved. However, if water is drawn from the hot faucet- even for a few seconds- hot water IS withdrawn from the heater,...