There isn't much to consider here except dosage.
If you wish to use doses of less than 500mcg it would be best to use 2ml (200 units) of water.
If you wish to use doses of 500mcg or more then you can use 1ml (100 units).
This allows you to accurately measure doses while not having to inject more fluid than required.
First, gather your supplies;
1Vial of Melanotan
1Vial/ampule of Wwter
1Take your Melanotan vial and pop off the top of the vial to reveal the rubber stopper. Wipe with the swab.
2If using bacteriostatic water, pop off the top of the vial (if applicable) to reveal the rubber stopper. Wipe with the swab.
If using sodium chloride, twist off the top of the ampule
3Next insert a syringe into the vial/ampule and hold it upside down.
4Withdraw your water and inject it slowly into the Melanotan vial aiming at the side, not the powder. This make take several attempts based on the size of your syringes.
5Place in the fridge for a few hours or overnight while the powder dissolves, you can swirl or tilt the vial to help. Some residue may remain.