I do the 100 tea bags in boiling water method, but then I do a 6 gallon batch.
I use Luizianne Tea, and keep a 1 gal bottle of Tradewinds Sweet Tea handy to use to top off.
I boil/simmer the teabags in a gallon of water for about an hour...transfer to fermenting bucket, add water to the 5.5 gallon mark, then stir in sugar (I usually use three 4lb bags) to get to the potential alcohol you want. Throw in some EC1118, and let it go for a week (at around 72 deg F).
After a week, rack to secondary and let sit for another 2 weeks. Measure SG, if below .996 stabilize, sorbate, degass, clarify (using whatever method you choose) and top off with the store bought sweet tea, after a couple of weeks, rack off of sediment into fermenting bucket, add 50 teabags until desired color, then sweeten to taste.
I usually use the Tradewinds sweet tea for reference when back-sweetening. I then rack back into 6 gallon carboy, and top off with the sweet tea.
I use the "Wine on Tap" system for this type of "fermentation". The first batch last summer I did 2 bags, and 12 bottles. I just did a batch with 1 bag and 21 bottles. I'll do another batch before spring and get a couple more bags for myself...the bottles from my last batch have been spoken for already. It's very smooth over ice. Here's a pic of the final product...this is a 1.5 ltr bottle from the latest batch.
The beauty with tea, is that you can make it look, taste, however you want...it's a blank slate...do your own thing, experiment!
Peace,
Bob