I assume you know you need to sterilize the tops of all three vials, bacteriostatic water, Tirz, empty with an alcohol swab and allow to dry.
Attach syringe to 3ml needle, draw 3ml air, inject into bac water vial stopper down. Draw 3ml bac water. Be sure to eliminate air bubbles by flicking syringe with your finger, reinject air pocket into vial, and draw again as needed.
Remove from bac vial, and while holding tirz vial stopper side down, insert syringe at an angle toward wall, to avoid directly injecting into powder. Vacuum should suck the water into the vial with no effort on your part.
Remove empty syringe from tirz vial. Draw 1.5ml air into syringe, and inject into tirz vial with stopper pointed up and NOT INTO LIQUID to avoid creating bubbles. If there's resistance you can stop trying to inject air. Remove syringe, recap, and put it down.
Roll tirz vial between palms of your hands for ten seconds. It should be clear at that point. If there's any visible powder move it around (no shaking) until it's fully reconstituted.
Gently put it down and leave it for 10 minutes.
Take your 3ml syringe, uncap, push all air out. Insert syringe into tirz vial stopper side down. Draw all liquid out of tirz vial, remove air bubbles as above and draw more until you've got all liquid out. Try to avoid injecting air into liquid by pushing needle above liquid level.
Recap, unscrew and remove needle from syringe. Screw threaded filter end onto syringe. Press needle onto filter (it's a push on "slip connector", not threaded).
Remove cap.
Take new empty vial, stopper up, insert needle at an angle towards vial wall, Slowly inject liquid into vial.
Remove syringe. Draw 1.5ml air. Reinsert syringe into tirz vial stopper up, needle above liquid level. Press plunger to "purge" remainder of liquid in filter into vial.
Remove syringe and discard.
Every 20 units (.2ml) you draw with your insulin syringe will be approx 2.5mg dose.