Okay, this is total noob territory for me.
I've made a few wine kits which have had pleasant and drinkable results.
I have a few wine books that are around 30 to 40 years old. I've made a batch of country carrot wine because it seems to be highly recommended in all the stuff I've read. One thing I spot is a lot of the wines I want to make are from lacking in Tannins. I know I could add powders and chemicals available but I like to use what I have to hand. I read that a cup of cold strong tea is adequate to add tannins sufficient for 1 gallon of wine.

But I was thinking in All Grain brewing one of the requirements is to keep tannings out so we stop sparging when the runnings get below 1006 and keep the temp down below 170.

So I was thinking, If after I finish brewing I run boiling water over my remaining grist and collect would I be able to use the collected water for wine.
It would have a low sugar content, some barley flavour and hopefully enough tannins to make a good country wine.

Any thoughs, comments or suggestions?