I had my pot sittin on a rack so the pot wasn’t sittin IN the runoff water and when I dumped it it was 8.5 cups of waterI water until I get a cup or 2. I think getting run off is mostly to wash salt buildup down and out of the pot/medium before it becomes an issue. As long as the pots don't sit in it I think you are good.
I hope if I am wrong someone saves you!
I water my plant on Monday then again on Thursdaywas that from dry or just damp soil?
you could use a tray under the pot and allow the water to be sucked up into the pot, this is what i do with any plant or veg i grow in pots
if you start with a given amount of water and give it time to suckit up, you can take a measurment from that.