Hello. I have wanted to make a fruit punch wine as well. How much fruit would I need to make in a 1 gallon carboy and other ingredients Please?
Per gallon I'd say get a 4 pound bag (give or take) of frozen fruit at Wallyworld/Costco/Sams/your-neighbor's-freezer/etc. Thaw and mash the fruit. A strainer bag would be good to use. Add enough water/grape-juice/apple-juice/etc to make about 1.25 gallons of must. Check SG with your hydrometer and determine how much sugar to add to raise the SG to the desired value.... 1.0860/1.0900/1.1000/etc. As for k-meta, pectic enzyme, tannin, acids,...use the usual prescribed amounts (though maybe double the PE...or triple it if there is lots of apple, pear, peach in the mix).
I mentioned a hydrometer above. You definitely need one. They are glass and fragile but handle them reasonably gently and they will last a long time. Simple to use and inexpensive, but oh so necessary to ferment wine properly...the #1 wine-making tool. You can make wine without one, but you have much more control over the process if you know what your specific gravity is during the process (it will change).
Basically, I'm finding that the fruits and juices that are added are for flavor, body, mouth feel, etc.,. The combined sugar content of the fruits, juices, and refined sugar determines the alcohol content. The more fruit, the more taste. The more sugar, the more alcohol. And, vise-versus for both. The balance between the two goes a long way to making the wine good. Tannins, pH, acids, all contribute, too, but if you have paint thinner strength alcohol the flavor will be overwhelmed and the acid/pH/etc will do little to correct that. Conversely, if the alcohol is too weak the wine make fall flat and taste more like a sweetened, watered down juice.
To "wing it" without the proper tools you might want to look at Jack Keller's website for lots of wine "recipes". This link starts with a recipe but scroll down below it and you'll find a long list of recipes:
Jack Keller's Requested Wine Recipes . Lots of other good information on his website, too!
Best wishes,
Ed