Question from Charles Brown:
“does watermelons have there own yeast and grapes/fruits trying to make wine for the first time and my friends say i do not have to get yeast because watermelons/ grape already have yeast, is this true.”
While it is true that there are airborne yeasts everywhere that will cause fermentation to occur naturally, the yeasts in the air vary a lot in quantity and type. You can’t be sure they will make wine from your fruit. Many naturally occurring yeasts will not tolerate a high level of alcohol for instance.
By providing a closed environment for the yeast of your choice to work in, random yeasts are eliminated, and other contaminants are kept to a minimum.