That's one guzzling, high maintenance 'mater plant. What river can you tap into when it really gets hot? (;
The real issue is all roots and not much soil. It’a cherry tomato, and I planted it in a 6 inch pot intending to replant it into a larger pot, which I never got around to.
I am planning on burying the pot in the ground, and then digging a trench to the side for the large stalk which is hanging down, pulling off the leaves, and covering at least 18” with soil. I’ll put the continuous watering as needed bottle/ceramic gizmo in the pot, and water the trenched part as normal.
My granny used to grow tomatoes at the river’s edge. Best ‘maters in the world!