@Ethan diy, the thing is, it’ll be easier to store if you leave the bulk of it at 100 mg/ml, and just dilute maybe a quarter of it down at a time using the 50/50 method you mentioned. That’s what I do, anyway. I pour 60 ml of 100 ml/mg into my trusty mixing bottle (catsup bottle from Walmart) then add 60 ml of pg (or vg) and I have 120 ml of the 50 mg/ml nic juice to make a bunch of ejuice without having to mess with the 100 mg/ml stuff for quite awhile.