The gallon of apple juice can be drunk over time, as long as it takes. Just 8-16 oz a day is fine. :)

If you take Malic Acid, take 1000 mg for at least 3 days, preferably 7. Same with Liquid Phosfood.

Any brand should be fine, I'm not sure if any of my favorite manufacturers makes these. I like Solaray, Kcal, and let's see... Nature's something. :)

Hope that answers your question! :)