How can we conserve water from kitchen sink?

I would like to conserve water from my kitchen sink and need your help. There are times when I need to use hot water and run the tap until the water gets hot. I would like to buy/make a hose that I can attach to my sink so I can run the water to another container. Kitchen water taps are threaded so an aerator can be screwed on, is there a hose that can be similarly attached to save water?