I enjoy squeezed lime in my water. And I tend to purchase a big bag of limes when at Costco. It is cheaper than purchasing one or two at a time at the grocery store. But when I buy it in "bulk" it seems that I don't make it through the bag before they start to look not as fresh as when I purchased them.
So here's the trick. I squeeze the juice out of half a lime and fill up a ice cube tray with it. It works out perfectly because I usually just squeeze 1/2 a lime into my glass each time.
It not only saves money by not wasting any limes down the road it also saves time whenever I'm on the run.
Lime cubes--love 'em!