When you're stranded somewhere with no water available to drink to survive and all you have is your urine then that would be the best thing to do is drink your urine over possibly dying from dehydration.
When your urine first comes out of your body it's pretty sterile but after it sits out in the air for awhile it becomes old and non sterile.
I would not drink my urine unless it was the only option and if I can find some water through a creek, pond etc then that would be my first option.
I always make sure I keep bottles of water with me when I go camping or hiking to avoid going without water.
If there's is snow and you have a way to build a fire you can melt the snow in a tin food can or something else if you have something available.
Or eating the snow directly would be much better than drinking your urine.
If you drink too much urine then it could become toxic.
But if the alternative is possibly dying from dehydration or starvation anyway then it's not gonna hurt anything to go ahead and drink your urine to help you survive.