I used less water when brushing my teeth. Instead of leaving it on full force, I turned it down to a trickle of a flow. Just enough to wet the toothbrush and rinse my mouth and the sink.
I used less water doing laundry by making sure I didn't need to use the full load cycle.
I used less detergent realizing the clothes in that one load were not that dirty.
I used less hot water and more bleach in the white load of laundry that did need more work to get clean enough.