Sir, I believe that "kill" is a rather dangerous word. I also believe that both of your concerns can be taken care of within the week. Personally, I would follow a liquid diet of strained, organic vegetable juices - broccoli, cauliflower, cabbage, kale, collards, lettuce - and to this I would add slippery elm gruel taken as many times daily as I saw fit (at least three).
Candida overgrowth needs to be balanced, not murdered, and the leaky gut needs repairing. The above takes care of both, I feel.