Toilet flushing uses 26% of your indoor water use. Pouring a bucket of water into the toilet will flush it. Save a little to pour in after the flush to bring to a normal level. Put a bucket in your shower to collect water while waiting for water to warm and leave it near you to collect the runoff. Put containers in sinks to collect water from hand washing, fruit rinsing, etc. to fill buckets. Remember the yellow mellow rhyme.