I found something that helps my arthritic thumb

Where do you purchase this borax? I can remember 20 mile team borax commercials for laundry

1/4 teaspoon in any liquid? What does it taste like? Does it have to be a quart of liquid?

Walmart in the laundry aisle. 20 mule team is the stuff.

I put it in grape gatorade and cannot taste any difference. I would imagine you could put it in most anything but being that it has a basic ph, mixing it with soft drinks would likely cause it to fizz like crazy and go flat. It doesn't have to be a full quart and one of the dosing options is "a heaping teaspoon in a quart of water" and then drink a teaspoon of that a day. From what I gather the taste isn't fantastic that way.