with Ursula's good advice, but a couple of points to add:
I've let recovering Phals sit on a table in the shade with no medium at all for days while I was getting materials together for re-potting. (but I do live in Florida, where it is generally warm and humid) So yes, you can wait 10 days to get your supplies. Just mist the leaves once in a while. A chunky bark mix is what I use for mine. Your local nursery or garden center will have it.
When you re-pot, try to place the plants so that the crowns slant sideways, not upwards. This way the water never sits in the cup of the leaves which can invite crown rot that will surely kill the plant.
Pots for Phals need to have holes in the sides as well as drainage holes at the bottom. Orchids need a lot of air to their roots, and especially Phals like the ventilation. You'll find as they recover they will stick roots upwards into the air. Don't feel you need to cover these - the plant is collecting nutrients from the air that way. Those roots will also attach to a piece of wood or cork if you put it within reach.
Pot with holes, plant slanted sideways:
This little one kept crawling out of the wood basket, and falling to the ground. So I inserted the piece of cork, and it has happily attached roots to that now. I do need to water this one more often than the potted ones. Just a douse with warmish water about every second or third day if it doesn't rain.
