Nismo.... to accurately water your plants, firstly make sure your water has a ph between 6.2-6.8, after that mix up your nutes if your using any. i usually mix gallons of water at a time, then i take that into the garden area. take large container of water and pour it into an average size cup. use this cup to water the plants. pour cup in, wait 20 sec or so to check for runoff, then pour more in. water your plant until water begins to drip from drainage holes, not pour. that's why you wanna give each cup you put in some time, to allow soil to absorb before adding more. when water leaves container, your done. to know when to water plant again, push your finger about 2" down into soil. if it's at all moist there, leave it go another day. if it's dry that far down, give her water.... it's nearly impossible to over or under water using that method.... good luck