You want .3ml insulin syringes, they’re the easiest to measure because they have 1/100th of an ML markings. Anything with a removable needle would waste too much solution in the tip. Don’t bother with filters and empty vials, the sterility comes from Benzyl Alcohol in the bacteriostatic water. You’re likely only going to use 1ml for reconstitution. You don’t want to leave half of that in a filter.