not true, urine in not ammonia at all. It is 2.5% urea, which can eventually break down into ammonia, but that takes a while. Urine is not ammonia, it is closer to blood.

Do not get scientific information from these kind of sources. Dual Survival? Really?!

google it looking for scientific sources, not morons talking about things they don't know anything about...
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A lack of safe drinking water is a common result of disasters, natural or otherwise. But some people argue that even in such situations we have plenty to drink, as long as we don’t turn up our noses at it. Squeamishness aside, is it safe to drink your urine?

With several caveats and under certain conditions, yes, it is safe to drink your urine.

[link to urologysurgerycenter.com (secure)]
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This is western science above. In real life, eastern societies have ingested their urine for millennia safely.