A 10 gallon pot with a big plant in it should take at least 2 gallons, probably 3 gallons when it's deeper in flower. My 7 gallon pots get 2 gallons in flower.
It's possible that not all of your roots are being fed with that little water.
Ok, hungry
and thirsty.
I would suggest this. Tomorrow, when you get your worm castings, mix up some with the water you're giving your plants. This time though, make up a big batch, maybe 2-3 gallons. Then water slowly, and over time, with this worm casting extract (this is not worm casting tea, but is good stuff). Also, in an organic grow you don't have to worry about pH unless it's way high or low which would be unusual.
Water a little bit, maybe a quart or so, then walk away for a while (10-15 mins). Then come back and give the plant another quart, again watering s-l-o-w-l-y. Walk away. Do this until the soil is completely saturated and won't hold any more water.
At first, assuming the soil is dry, you will get some runoff pretty quickly, but that doesn't mean you've thoroughly watered. All it means is that the soil is hydrophobic and won't easily re-wet. Some fresh aloe juice added to the mix will help if you have a plant growing in your house.
Once the soil won't hold any more water, take note of how much she took and then see how many days go by before the pot is once again surprisingly light.
That should resolve the thirsty issue. Next comes the suspected nutrient deficiency the plant has to get a better, richer color which your answers to the questions above should help us identify.