The trio needs water, and the dam has plenty of water.
That much is clear.
It seems like too much of a magical fix.

Credit: Richard Foreman, Jr/AMC
Madisons loyalty to her friend leaves little room for debate, so they all descend into the darkness below.
We linger in the tunnels with them as Walker becomes increasingly more impatient over Victors aimless leadership.
But he gets them all lost.
Alone, Victor finally confesses to Madison that Daniel is alive and at the dam, saltier than ever.
Shes not worried, though, because she can make good on his promise to deliver Ofelia.
Victor then spies the mark, but Walker hurries towards them, warning that the walkers are in pursuit.
It slowly dissipates, however, when they reach an engorged walker clogging up the pipe.
Perhaps Im becoming numb to these predictable jump scares, but this one didnt pack a punch.
This wasnt one of those times.
When they arrive at the dam, Daniel is fleeing a situation thats boiling over.
As theyre re-chaining the gates to the dam, Daniel notices something moving in the bushes.
He fires his gun and finds Victor cowering on the ground.
Daniel raises his weapon to shoot again, but Madison steps out with Walker.
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It turns out his hands are tied.
She does, however, allow them to leave in the morning.
Lola approaches Daniel in his bedroom, piecing together that these newcomers know Ofelias location.
He assures her, however, that hell stick around and fight against the dangers encroaching on the dam.
Madison attempts a final plea.
Lola is trying to appease everyone, not realizing its an impossible feat.
(Oh really, Victor?
Never heard that one before.)
But he sees the dissent already growing within Lolas ranks.
Lola warns Daniel that if he chooses to stay, hed better follow her judgments.
Can Madison find happiness for herself?
Is that even possible?
This act of violence convinces Lola that action must now be taken.
However, it felt unsatisfying given the unevenness of the episode.
Also, what about that truck they were supposed to retrieve by the sewer entrance?
Conflict doesnt seem too far behind, evidenced through a few foreboding lines.