Depending on the season and your grass type. But if your neighbor has green juicy grass while you ready to roll yours into a haystack, then you most definitely need to water your lawn if you see wilted grass.
All you need is aerator and sprinkler system or garden hose.
Next step is to clean grass from debris and old dead cuttings. You will need to aerate your law for 3 seasons: spring, summer, fall. It will help with water absorption.
It is advisable to water grass either early in the morning or late afternoon, my advise is to do so early in the morning, this way grass will not burn under the sun and will evaporate before nightfall not to cause rotting and mold .
To keep up with watering scedule, you can purchase a simple inexpensive timer, large variaty of such are sold in all home-improvement stores.
Thank you, hope we were able to answer your question.Best regards,
Express Lawn Crew.