To test for Candida: Before going to sleep, pour some bottled water into a glass and place glass on your bedside table. Upon waking, spit into the glass of water as soon as you wake up. (Do this before drinking, eating or brushing your teeth.. If your spit floats on the top, you do not have an overgrowth of Candida. However; if your spit looks like what is illustrated in the glass pictured above, then you probably have Candida in your intestinal tract.