Pack the peppers and garlic into a quart jar until 80% full. Add the salt to the peppers and then pour over the water to completely submerge the vegetables. Use a fermentation weight or homemade alternative to weigh the peppers down to below the level of the brine.
1 scant quart hot banana peppers, 2 cloves garlic , 2 1/2 tablespoons sea salt, chlorine-free water as needed
Seal the jar with a canning lid and ring or an airlock and leave to ferment at room temperature for at least four weeks. During this time if you haven't used an airlock, you will need to "burp" your jar daily for the first two weeks in order to release the carbon dioxide produced by the fermentation process.
After four weeks the peppers should be tangy and fully aged and fermented. They will keep for months in cold storage - a cellar or refrigerator - or even at room temperature.
When you are ready to prepare the hot sauce, simply place the peppers, garlic, and 1/3 of the brine from the jar into a blender. Blend, adding more brine as needed to achieve the proper consistency. You can also blend it in a wide-mouth canning jar if you have an immersion blender. Taste and add salt or apple cider vinegar if you feel it needs some extra kick.
The hot sauce should then keep for weeks refrigerated or on the table.