I think you're good on de-worming.
Re-check the poop for the next few days and see that their crops are emptying overnight.
If the crops are not emptying, then let us know.
The extra water drinking is due to the heat. They may be drinking so much that it's flushing feed out before it's processed. Just a thought on that - I'm not 100% positive that's doable, but...
Any chance you have some rodents eating the food too? If you leave feed out, you may want to bring it in. I'm not sure how your setup is. I take up feed at night to deter critters. This time of year especially, I can get rats from the orchards...ugggh...I try to keep my traps going just in case.
If this is the first notice of droppings like that - I would be inclined to wait and see if there's a repeat.