I think working with a coach who can give you advice on this would go a long way. Obviously, cruising is probably going to be your best bet. You want to treat it like chemical warfare going into a contest.
If you stack too many cutting steroids, you can end up with some joint issues so you want to be careful. Having said that I think Winstrol blows anything away, especially if you want to cut down.
You need to be careful when it comes to diet soda. There's a lot of artificial sweeteners. These have been shown to really affect your brain and your gut health.