Grapefruit Auto

If you've got a 6 gallon fabric bag, you'll know when to water by touching the outside, or doing the lift the pot method to see if its light or heavy. Also if you had some good ventilation or at least a fan or 2 blowing things around it'll help dry that baby out in a reasonable time. Also since the plant is still relatively young and small it doesnt drink as much in a large pot, so you could always water close to the stalk of the plant occasionally instead of soaking the entire thing. Best of luck to you happy growing.