1. Give plants that are drought and heat sensitive a nice slow, long drink to properly hydrate them. This will allow the water to properly moisten the soil and roots rather than running off where it is not needed.
2. Make sure the soil is moist but not over-saturated which may lead to rotting roots - no one enjoys continuously wet feet, including plants.
3. If you have mulched around your landscape plants, be sure to pull the material away from the crown of the plant to allow air circulation preventing a humid environment favorable for to viruses and bacteria.
4. Short on time and have a fussy plant? Drill several holes into the bottom of a 5-gallon bucket. Place bucket near plant and fill with water. It will deliver water at a slow rate, penetrating the soil deeply.
Lastly, just like you, it is very important to hydrate your plant before it gets heat stressed so that it can recover quicker.