I bought a Nalgene travel kit which comes with a lot of different size plastic containers, squeeze bottles, and lids. It fits perfectly into the mid size hard container. All clear plastic as well. I put a few breather holes in one of the lids and called it a day.
It's a pretty awesome kit and I use it a lot. I put my Bigelow Vetiver shampoo in a squeeze bottle, my Pinaud Bay Rum in a squeez bottle, and my shave cream and as balm in the screw cap hard bottles.