1. Place a bucket in the shower and use it to water your planters, shrubs and trees. A little soap is okay but try not to overdo it on the lather.
2. Put small holes in the bottom of a utility bucket. Place at the base of a tree and fill with water. This will serve as "drip irrigation" and slowly absorb into the soil.
3. Make your own water by running a dehumidifier in the house. This will generate gallons of water a day, which can be used to water your landscape plants.