@G259 has given a good wine recipe if you want to cook book it.
* wine and hard cider and pickles and yoghurt and even cow silage are preservative systems. They vary by degree, but all are based on removing the fermentable sugar and replacing it with a byproduct as lactic acid or ethyl alcohol. ,,,, you are not likely to kill yourself
EVER if the pH is below 3.5! The good news is most grape and apple is below 3.5 so we have a head start on the fermentation, one preservative barrier is there.
* apple wine and apple cider and apple port vary by percent alcohol, the higher the alcohol the fewer organisms will grow. At low alcohol the main risk is vinegar which requires air (oxygen) and some folks will intentionally make apple cider vinegar.
KEY, the presence of oxygen is necessary to make vinegar, ie we use air locks and minimum head space.
NOTE there naturally is some acetic acid which adds complexity, just don’t let it get out of hand.
* alcohol is a fairly high energy molecule which naturally wants to combine with oxygen producing acetaldehyde which at high levels contributes a burn note in the back of the throat, therefore we use air locks and minimize head space.
NOTE at low levels it doesn’t hurt and adds complexity, just don’t let it get out of hand.
* a lot of what is in WMT is making pretty wine, so we let it sit a half year plus for gunk to settle out. It still will taste good with a little gunk and by reducing time less vinegar and acetaldehyde flavor develop, ie for getting your feet wet drink it young.
* i try to not use water since there is less flavor in water than apple juice, or grape etc
* yeast occur naturally on the skin of grapes and apples, fresh cider with no preservative will ferment by itself. ,,, what kind of apple juice? commercial bottle stuff? Wine yeast are really good since they tolerate higher alcohol as 12% or even 18%, a lot of natural yeast die off at 8% (ie native apple without added sugar)
* temperature, a lot of apple cider will get 10C (50F/ unseated garage), fruit wines get less than 18C (ie room temp) and red grapes get 25C. High temp loses fruit aroma and stresses the yeast risking sulfur aromas (ie yuck/ toilet). Yeast work faster at high temp so a garage may take a month or so.
* wine and cider are hedonic, does it taste good? We spend a lot of time looking for the perfect blend of acid, high sugar, and high dry matter (the flavor is in the solid matter)
what else? Oh!, welcome to wine making talk!, and have fun!