When I said "try getting them back to water",
I meant
"wait for a weekend when you're at home. Put them in shallow water (1 to 2 inches deep - the length of the animal) with a lot of aquatic plants so that they can climb on the plants to easily reach the surface and not draw. Detect the efts which are reluctant to stay in the water (they never put their head in the water and try to climb outside the tank) and put them back in their terrarium (Next time perhaps).
If an eft eats underwater, you've won
Update : once metamorphosed but still in water, it's very important to feed them a lot. I feed mine with frozen bloodworms, change the water every other day to keep a good water quality and I'm helped by little snails (Physis) to get rid of uneaten food.