I like the itty bitty dropper bottles from Gossamer Gear. They can be used with or without the dropper insert. I just wish they sold all translucent bottles rather than half opaque and half translucent--it's nice to be able to see how much liquid is in there. I tried the BPL bottles but they are all opaque and too firm to squeeze. The only liquid I take that (even for a 10-day trip) that is too big for the little dropper bottles is olive oil. REI sells small Nalgene bottles down to 1 oz. The 3-oz. bottle works fine for me, although I might take a little bigger bottle if I decide to go fishing.
May your trails be crooked, winding, lonesome, dangerous, leading to the most amazing view--E. Abbey