Broken or missing sprinkler heads can waste more than 12 gallons of water per minute. Don't water when rain is in the forecast. Use a watering can for patio plants. Using a hose puts more water on the patio than in your flowerpots. Increase your mowing height to 4 inches.
Longer leaf blades shade roots and help retain moisture.
Consider converting thirsty turf into natural areas. Reduce soil compaction. Aerate your lawn 2-4 times per year. Renovate highly compacted areas, which includes tilling 6-8 inches. Reseed fescue in the fall.