RDA for Iodine is kind of low. The upper limit is actually quite high and the Wolff-Chaikoff effect seems to be either temporary or not even real. But have your thyroid checked if you're going to supplement Iodine just to be sure.
I take 400-600mcg of iodine every other day. This is 2-3 drops in water. The carrier is ethanol. Pure iodine doesn't dissolve in water, so the drops become a cloud when dispensed into water.