watering question 3 gal pot foxfarm ocean forest

I let the pot dry up incase I overwatered , so now it's time to water. I use sink water withphat 6.5 , how much water should I add?

water till you get some run off then stop pretty simple

What hellraizer said. Mine are in the same pots, same soil and use up about 1/2 gallon every 2 days. But they are in flowering under a HID so it may be more/less than what you'll need. Just water till it runs out the bottom (aka "make it rain") have a drain pan of some sort so they don't sit in the leaked out water.