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To the people saying drink more water, some people in the piss kink scene like a more dehydrated piss because of the color, taste, and odor. Some people like more diluted, and what you eat/drink can also change these things.
Here's also your regular PSA that this is porn and you should do your research before attempting this. Anal gaping is usually recommended when pissing in the ass because if you don't have an air pocket the pressure build up can tear the tip of your urethra when you pull out. Also make sure you clear yourself out with an enema and that your colon isn't inflamed or sensitive (the ammonia can cause burning and immediate bowel voiding in sensitive individuals).