Hi Raindrops27,
I'd give it the old sniff test and see if you feel like drinking it. You will probably find that it's very acidic and it may smell like nail polish remover. However, the grains will probably be ok as they can go for much longer than a month without being killed.
If it smells terrible, then it would be a good idea to rinse the grains in non-chlorinated water. I don't normally rinse my grains if I can help it, but sometimes rinsing can help. Afterwards, you could brew the grains in small amounts of milk just to make sure that they are still viable.
HTH,
Linda
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