Revived the office-Phal but won't survive out of water

[NMFD]

So I inherited caring for the office's orchid when I started my new job. It's a big highrise and the orchid was in a tall pot, far away from any windows, and was showing signs of dehydration - limp, veiny leaves, white and shrivelled air roots.

My colleague was watering it a ton until I took over and it was in the original pot (tall-ish, mixed media and some really prickly moss) - it's probably 2-3 years old.

I pulled it out, gently washed it off, cut the dead/decay off and tried to repot it with new orchid media and water weekly with 3 ice cubes and that didn't work at all. It grew more dehydrated though it did sprout a new leaf.

I've completely changed tack and it's now sitting in a wide, flat bowl filled with only water or alternating with diluted black tea. It has perked up amazingly and all the leaves are standing up. It's now in a sunny window that gets a couple hours of sunshine.

My question is... I've tried removing it from the water and sitting it just above for overnight periods and when I come in the next morning the roots out of the water are all dried and wrinkly again. I doubt it is best to stay in water indefinitely - but I am thinking it needs a wide shallow pot instead of the common tall pots offered by most nurseries.

How can I get this orchid to continue being healthy in our very dry, not orchid friendly, environment?