The body is a quite complex system and it is not that easy. It depends on what you mean with “environment”. Blood ph levels and ph levels in the stomach, intestine and colon are at different levels. In general, your body must be alkaline to function well. If not, you deprive your body from essential minerals (like calcium, magnesium, …). Things that make your body alkaline are raw vegetables and fruits (especially citrus fruits, like lemons). Things that make your body acidic are things like red meat, coffee, alcohol, … (the reason why you can’t eat these).
BUT Your intestines have to be acidic. Your stomach has to be very acidic, otherwise all sorts of pathogens can enter your system. Candida likes an alkaline environment. This is why your intestines have to be acidic too. Hence to probiotics and the acidic antifungals.
Candida is not really a disease, it is a symptom of an underlying problem. For example, a sick body that is too acidic and can’t get rid of its toxins. The solution of curing candida lies in restoring your body by alkalising in general (the diet) and acidifying the intestines (probiotics). This way your body can function properly and can eliminate the candida itself. Some believe that most diseases (even cancer) are caused by a body that is too acidic. I tend to believe this, but I’m still figuring out how far this is true.
To come back to your question. Your body has to process the ammonia that is produced. So as long as this ammonia is in you, you help the candida. I doubt urinating will reduce the ammonia in your blood/gut.
Taking HCl supplements is only going to acidify your stomach. The optimal level of HCl is right before you feel a burning feeling. Taking more HCl is absolutely not recommended and can damage your intestines.
The discussion about alkaline/acidic environment is something that has been discussed a lot of times so far. This is how I interpret it and what I believe right now. If someone wants to prove me wrong, go ahead.