How to build the perfect campﬁre 1) First, ensure your other essentials are in order: a clean camp, stowed food, and a system for water puriﬁcation. 2) A urine puriﬁcation system can help you reuse the water you have. You can hydrate and prepare to make that ﬁre! 5) Imagine all the urine you could reuse, imagine how pure it would be, for drinking and puúfying, drinking and purifying, and drinking and purifying once again. 4) Skip the ﬁre. You don't want to waste any puriﬁed urine putting it out.