How can you tell when soy/almond milk goes bad?
(I'm thinking specifically of an opened box of almond milk that got left out accidentally for about 18 hours. Oops! I'm guessing that one is shot... huh?)
ETA: Wow! I had no idea this would get so many responses! I hadn't planned on actually drinking the almond milk that got left out. But it just made me curious how I'd know if it actually was bad...
The suggestions below are really helpful. I will keep the almond milk for a while and see what happens to it... and I've got an older thing of soy, too. So I'll report back on my "experiment" when I've got some results!