Those look pretty bad. I hope they were given to you(?), Rather than sold.
1. If they were sold to you, try to get your money back. No one should sell plants in that condition.
The rest of the advice assumes you really want to try rescuing them, and don't mind the rescue process being a giant pain-in-the-neck. Many on this forum might advise just tossing these and replacing with healthy new plants; they would not be wrong. I'm just assuming you like a challenge, and that isn't wrong either.
2. One plant at a time, would first carefully remove remove any dead/dry/brown leaves, using flame-sterilized scissors (get a dollar store pair that you don't mind discoloring the blade with, using an open flame such as a gas burner or candle; sterilizing the tip 1/3 of the blade is usually enough). Cool before cutting the plant.
3. After the dead leaves, if you have green leaves that have brown watery tissue that seems to be getting larger, trim that green back to healthy-looking tissue. If it is green, but has brown attached that seems stable (not growing into the green), you can leave it, or just trim the brown off.
4. You should now be able to see the pseudobulbs clearly. Any that are firm/hard and green can stay. Any that are brown and soft should be removed. Cut the rhizome with your scizzors to separate the good from the bad. Pseudobulbs that are brown at the base should go. You may have some that just have a little brown at the tip, and may be able to cut that tip off (dollar store knife, well sharpened, also flame sterilized).
Flame sterilize cutting tools before moving to the next plant. While working on the same plant, if you cut into any tissue that seems rotten, flame sterilize before cutting green tissue.
5. If, after all that you still have some green leaves attached to solid green pseudobulbs, consider yourself lucky. Set each such plant to one side, in the shade, don't water for a few days, see if any brown rot is creeping into the green. You may need to do more trimming.
The bark you have the plants in is pretty coarse. Consider putting what remains of each plant into a much smaller pot, medium bark with a little sphagnum. Water carefully, keeping the plants under close observation to be sure no rot is coming back. Hopefully some new green will develop.
Good luck.
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What if there is only one shriveled bulb left & even it shows signs of discoloration but still green? I have heard people having good luck with rescues like this by using a seaweed fertilizer... any suggestions? I live on the West Coast of Central Florida & have 95% of my plants outside but all my orchids on a covered patio with a good breeze, high temperatures & humidity. I provide a little mist daily to the soil of the rescues along with my seedlings & vandas. I usually do a complete weakly & weekly soaking once a week & have been including the rescues in that routine (fertilized once so far). Is it ok to repot them so soon after the original planting? There were hardly any viable roots to begin with but I want to save whatever I can. Thanks again for the awesome info! I am so happy I finally found a forum like this 
I have been growing den & phals for years by trial & error but finally branching out & getting wayyyy in over my head already 😂
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