Help with a rootless phalaenopsis

[GoldStar135]

Hi everyone! This is my first post on Orchid Board, and I'm excited to join the community!

So this year I received a phal (my third phal, fourth orchid) for the new year. It had a really thick spike (thickest I've seen, maybe 1cm) with three branches. All branches were blooming and budding.

However during early February buds began blasting. The plant itself didn't look like it was suffering. It was potted in tightly packed sphagnum with a sort of decorative layer all around the pot (the hay-looking stuff on the outside).



I managed to take the hay out, and (with some difficulty) removed all the moss. There were a few dead roots here and there, but the majority of the root system was firm and healthy-looking.





I potted it in with some bark, perlite, and charcoal (the Better Gro orchid mix) and soaked the pot.

All was well until a few weeks later. All the leaves were flopping over.



I unpotted it today and found that ALL of the roots in the medium had died and/or rotted. I'm not exactly sure if the roots died first and then rotted, or if rot itself caused the death of the root system. I cut off all the dead roots. The very bottom of the stem was black and squishy, so I cut that part off and sprayed it with some hydrogen peroxide. I also cut the flower spike (kind of hurt to do so ).

I'm left with this:




There are maybe three tiny root nubbins that survived, and one small aerial root. I decided to leave it unpotted for now to let the stem cut dry.



As of now, my plan is to spray the root a couple times a day to keep it moist. However, next week I'm leaving for vacation and I won't be back for a week.

What should I do to keep it moist for the week that I am away?

Thanks in advance!