Got some Hcg for my up coming cycle (2500iu) and it came with the powder in one vile and 10mL of Hydroxocobalamin (B12) in the other vile. Does it make any difference if I mix it with what it came or should I look for some Bacteriostatic Water like everyone recommends it should be mixed with?

Also just to make sure (since this will be my first time doing HcG), I got two 2500iu viles because Im planning on doing 250iu twice a week for 10 weeks, does this mean I need a total of 20ml of BW to mix it so 1ml=250iu ???

Also I run the HcG up until the day b4 my PCT starts right?