drink lots of water
stick with low glycemic complex carbs (whole grains, oats, etc)
low salt
as far as controlling estrogen, the Equipoise - boldenone undecylenate - wont aromatize much, and 1g test may or may not create an estrogen problem depending on your tolerence and aromatase levels, so just the above ^^ may control the bloat. if you still need help, try an anti-aromatase like Femera - letrozole - or arimidex or aromasin at low dose and work up.
or you can start with proviron which acts as a mild anti-a and will also make your test more effective by reducing s.h.b.g binding