A good haemostatic supply

[harrypalmer]

Anti clotting agents are fantastic on a battle field where you'll have a medical team to clean the gunk out of the would when the casualty is safe but...not so easy for a poorly trained wannabe medic prepper to do.

For the average prepper who's not being shot at your best bet is direct pressure, maybe a tourniquet and something like an Israeli dressing if appropriate for the wound. Don't use the powder, the last thing you want is some of the powder blowing into your eyes.

Oh yea, do a first aid course or three.