I doubt its acid is so caustic that it could dissolve sticks lashed together while the acid is diluted from being under moving water, but agreed it won't last long.
It might simply tear the stick trap/net apart with sheer strength alone.
We don't really know much about it other than keeping it spitting acid under water is much better than allowing it to spit above the water!
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Pitting one group against another is a desirable goal! 😀
Another option is to use hit and run tactics on the ants. Used ranged attacks and even traps. Withdraw when needed. Press attack when we can.
We can heal quickly, they can't. They also can't replace their numbers quickly, so if we can get a kill and run, come back and get another kill, each time it will get easier to dispatch the group.
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One thing is clear, we need to try to use ranged attacks, cover and concealment, and pre-planned battle strategies and avoid close combat until it's the most opportune time to press the attack.
Especially since when anyone goes down in close combat, it's much harder to save them and withdraw versus taking damage at range, withdrawing and trying again later.
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Going back to town for better supplies is a good idea, unfortunately most of us are broke and we haven't even found a rabbit's hide to trade yet.