I went through a process of getting a saturated solution of EM. Watch the heating. It dissolves very fast when heated but the crystals reform quickly. One reason that's bad is that if you crush the EM it dissolves faster, then when it reforms they are big again. Neat.
Anyway, I dissolved it in ethanol, drew off the liquid after the crystals reformed, added more ethanol, redissolved, drew off, added more, etc. until very little reformed. I got about 10 ml of saturated EM/ethanol. You only need a few drops in 15ml, so this will last a while.
By the way, I made a EM/Lorann Marshmallow VG mix. Quite good actually. Wish I counted the drops, but I added EM until I kind of liked it and then the Marshmallow at about 10%. Mmmm.