Good idea about the contact lens case!
Now, I wonder why the KlearWater would turn clear so quickly? If I remember correctly, the stuff needs to be stored away from light (hence, the brown color bottle). Might that be the problem?
Separately, if you are interested in skipping the 5-min. measuring and premixing routine, then give Katadyn tablets a try. It's basically the same stuff and efficacy -- but in solid form and much easier to use! The packaging is extremely light and compact, and it's an easy thing to rip one open and drop it into a quart or liter size bottle.