Plz help, baby fire belly newt dying?

hi there, i have rescued 7 baby fire belly newts from a clueless pet centre 2 days ago (don't know yet if chinese or japanese cause the centre didn't believe there was even 2 diff 1s). the smallest (about 1inch n half if that) wont eat a thing nor go in water or move much. when i got them they had tiny shallow water dish so were all huddled up really dry and the 1 im on about seemed dead as it looked like a dried up twig. iv now put him in its own tank with enough water to submerge him self and a raised bit with moss (where he stays) iv tried blood worm (that's what they were being fed at pet centre) and tiny earth worms but it wont even open hes mouth. i keep spraying him with treated water to stop him from drying up but what els can i do? please help as i don't think hes gonna survive much longer, im surprised hes actually still alive now :( iv had newts in the past but had to move home so re-homed them but iv never had sick ones be4. she doesn't know how old they are either but said she got them about a week or 2 ago x