Here's what I use. I got it all from Wizard Labs.
3 1ml syringes
3 3ml syringes
3 5ml syringes
5 each of the 14ga, 16ga, 18ga, 20ga needle tips
12 10ml bottles
12 30ml bottles
If I'm making a 5ml test, I put together three 1ml syringes:
20ga needle for flavors
18ga for PG first, then reuse for nic (my nic is 100%pg)
14ga for VG
and measure right into a 10ml bottle.
I buy my nic in 500ml bottle, and PG and VG by the liter. So I also bought small (some 1 oz, and some 4 oz) amber glass bottles and a small funnel to pour each into a smaller bottle for mixing sessions. (Too hard to use a syringe to get out of the huge bottles) For the rest of the nic, I pour into 8oz amber glass bottles and put in freezer. Bought bottles and funnel on Amazon.
Labels for sticking on side of bottles (label the smaller bottles of nic, PG, VG, as well as whatever bottles of juice mixed up). Bought labels at office supply store, but they don't stick well over time, so will be looking for better label options.