Originally Posted by Jude

I'm not just being OCD about clean hands, although I do have tendencies in that direction - in this case, touching my contacts with grubby hands has a very tangible effect on them and how well I can see.

I can go ahead and use some of my drinking water, but when you're in a middle eastern summer, drinking less is not an option and saving water for drinking is key when the next source of potable water is a couple hours' walk away! I can easily go through three and a half liters in a morning's walk and still run out and be thirsty before hitting the next water source. Anyway, I'll have to look into some of these water purification ideas to make sure that some of that natural springs I hit are safe to refill at, though I'd still be leery about drinking agricultural water.