I think one thing that is overlooked in all these discussions
about Phalaenopsis culture is the food and water storage capacity of those thick succulent leaves.
Someone gave me a cot case to revive the other day, all the roots are dead, but the leaves give some hope of revival.
If it was mine i would put it in the bin but i'm giving it a try because it has sentimental value to the owner.

How do I begin to try to save this plant? With no roots, I'm imagining it's going to desiccate?
Any general emergent care tips would be great.

I have repotted the plant into a clear pot. Mix is bark and perlite. It will not desiccate because i have it inside in bright light where it will not get direct sunlight. Good time of year to do this here. Current conditions 24.3C Humidity 83%
But it is winter there and you might have to up the warmth & humidity. There are numerous past threads of Phal. rescues. I often wonder how many of those plants are still alive.

It does not need roots to survive. If it has healthy leaves, it will make new roots. With 'No' leaves it's a goner, don't waste your time. The flower was a desperation bloom. With it's last gasp it tried to reproduce, nothing else. Let it RIP and spend $5.00 for a new one, a totally different way of looking at what used to be desirable plants.

Nick

That's what I was thinking, Orchidnick. No roots and poor leaves? Goner.
I'll let it die a slow death on my counter, though. Hope springs eternal and all that.