How to make the own vinegar

Vinegar, in general, has distinct acidic characteristics that will affect a recipe; it's often used for this reason. For instance, in marinades, the acid is used to break down muscle fiber and help flavor penetrate. In Cevice, the acid component is used to "cook" the fish.

Additionally, the different types of vinegar have different flavor characteristics. I, personally, don't much like red wine vinegar as I find it kind of bland. I much prefer balsamic or champagne. So the question you really need to ask yourself is, "will the flavor of the red wine over the white wine adversely affect my dish?" You might ask the same question about the garlic.

So subbing one type of vinegar for another is fine if you're looking to replace the role of the acid in a recipe (also why you can sub lemon juice). Whether or not you feel the flavor can be substituted is really just a matter of personal preference. If you don't know ahead of time about the flavor, try it and find out for sure.

To specifically answer the flavor characteristic for your question, I'd say yes. Red wine is OK. As pointed out, swordfish is a hearty fish and should hold up fine. I probably wouldn't sub balsamic, would use champagne as a priority, would think long and hard about apple cider. If it was a lighter fish, I'd be much more wary about red wine.

You can absolutely make your own black garlic. All that is required is to have the garlic in a vaguely air-tight container (preferably individual wrapped or contained) for 30 days at 140°-155°F. My method, covered at my blog, is to put the garlic in mason jars in my light bulb heated black garlic oven, which can be made for about $30 and can ferment 12 bulbs easily for about $4 of electricity over 40 days. With the cost of garlic, glue, aluminum foil and the mason jars, the oven with one recipe is less expensive than an equivalent order would be online.

The first 30 days, the jars are kept sealed in the mason jars, to allow the garlic to ferment properly. After 30 days, the lids are removed and the heat in the box dehydrates the garlic, leaving a dried out head with shriveled black cloves inside of it. The flavor is reminiscent of balsamic vinegar and soy sauce, but without the sourness of vinegar or the saltiness of soy sauce. The oven design is easily doable for anyone of any DIY skill level with access to a hardware store and an Academy (where they sell the Huskee cooler I use for $25).