Quenchy

After supper the Princess made us drink some Quass: they put a little mint into it. It is certainly a very quenchy draught. The Princess could not help exclaiming how much is this superior to lemonade.

Source: wiktionary

Let the children drink their fill . . . They’ll love it and it’s doubly good for them, America’s “quenchiest” beverage.

Source: wiktionary

Not quite so quenchy but more cogent is the Ramos, or New Orleans Fizz

Source: wiktionary

For only one penny more, you get a full quart of Upper-10, the quenchiest lime ’n’ lemon drink you ever tasted, when you buy a full quart of RC, the quality cola, at regular price.

Source: wiktionary