Waterfast / Ammonia smelling urine

Hi, first time posting here, hopefully in the right place.

In an attempt to get rid of ammonia smelling urine, I'm going to do a waterfast. Years earlier I've done 20-30 days, but without this ammonia thing going on. Just wondering if it's safe to do with it, I've had this issue for over a year now and my body keeps telling me to do it...it keeps coming to mind recently. I do plan on drinking a lot of water beforehand.

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