Absolutely it's not only possible, humans have been doing it for hundreds of thousands of years.
There are so many yeast cells just floating invisibly around in the atmosphere that any solution with sufficient sugar will ferment.
Fruit contains enough sugar and water to ferment naturally.
It's why wasps tend to bite more in the autumn, they're all ratarsed on fruit punch !
Don't get fermenting confused with distilling.
Making booze through fermentation is both easy and generally successful
Distilling that fermented beverage, on the other hand is tricky and potentially lethal.
The easiest way to distill a fermented drink is to freeze distill.
Basically in winter, start with a lot if fermented liquid in a barrel.
Leave outside to freeze.
Remove the ice
Repeat until what's left no longer freezes.
And that will blow your head off !
It's the traditio al method of turning cider into scrumpy

And if you've ever had a scrumpy hangover, you'll think twice before making your own