"Do you know of other inexpensive healthy grains I could choose for breakfast? "

Don't eat any grains if you have a bad candida problem. Eat eggs and/or nuts/seeds for breakfast. Sunflower seeds without the shells are very inexpensive at some stores(under $2 a pound).

Coffee may help candida grow, or help destroy beneficial bacteria. I limit myself to just one cup a day in the morning(i can't give this up). Drinking plenty of coffee may also stress your adrenals.

In the past I tried eating oatmeal by saturating it with garlic, cinnamon, or other antifungal spices. That strategy still didn't help that much and I had to give it up.

The most important thing is to make sure you don't become constipated, as much of the mercury leaves the body through the bile which is then excreted through the bowel.

Peroxide can be dangerous. Use caution.