Well sure, you just use a syringe to add bacteria static water. The water is available on Amazon. How much water you add will control the concentration and therefore how much you inject.
So think about how much water you want in the syringe when you inject. Too much may cause a little PIP, to little is harder to measure.
You said Tesa so I'm guessing 1.5 mg per day dosage? If there is 5mg in the vial (thats really low BTW, are you sure? That's only a little over 3 days) and you add 1ml water, your dosage would be 0.30ml for daily injections with an insulin syringe.
See this link, and double check everything I told you.
Okay I tried to paste a link, it would not let me. Google "Peptide Calculator" and youi'll find a site that tell you how to measure all this.