Okay, I know I'm not supposed to be drinking any alchy-hol between now and Henley, but it turns out that cranberry juice with rum in it is really good. Really really good. Really really really good.
So I've decided that the benefits of the muscle-relaxing property of the rum (very good for my back) outweigh the detriments of the dehydrating effect. This is purely medicinal people, keep up now.
All this glorious concoction lacks is a proper name. Suggestions in the comments box. Best suggestion gets, i dunno, my undying admiration or some equally worthless shit. If there's already a name for rum and cranberry, I don't want to know about it.