First off, don't do anything drastic for a day or two. Iirc, new salvia cuttings often go limp like that in the first 24 hours but bounce back once they get used to the lower water intake.

I'd stick with water only for rooting. Make sure they're kept in shade or indirect light until they start to root, as the sun with dehydrate them too much. Mine do fine rooting without a humidity tent, so they should be ok without.

You may want to remove a couple more leaves from each, particularly any leaves with browning or damage as they likely aren't contributing much to photosynthesis. Plant aspirate out of the leaves, so they can lose too much water when they don't have developed roots to absorb more and are losing it from a lot of leaves.

If they don't pick back up naturally with those things, then possible cut again just below the next node up. Presumably you put them straight in water after cutting them, but if not, a fresh cut may help.

Good luck with them!