How many litres are left?
I don't fancy you'll fix it. I've been known on occasion to throw some stubbies/cans etc in the freezer for a quick cool down, and then forget about them I always use the defrosted beer in cooking. Make a beer and beef stew with some! Beer batter! Depending on how much you have, that could be a lot of cooking to be done.
Have fun!
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Dang, looking at half a keg of beutiful IPA...is it the fizz that has diluted the beer..?