RE: Pp and ?????
Have you used pp before?
If you haven't, how do you know you'll retain water on cycle?
To minimise water retention minimise salt intake and maximise water input. An AI may help on a test cycle but as pp is 5alpha reduced the likelihood of water retention due to oestrogen levels is minimal, rendering the AI useless in this case as far as I'm aware.
Just finished a pp cycle myself, no water retention at all, great compound. Apologies if you've used it plenty and have water retention issues with it, but I find the stories about it with pp are overblown & many on here will attest to it being a dry enough compound for them.