I would unpot it, get rid of all rotten roots or parts thereof, give the roots a good wash (use the kitchen sprayer or such) to remove the medium. You may or may not spray the roots with hydrogen peroxide depending on how much rot there is (there is a school of thought that H2O2 kills al the good bacteria on the roots and sets the plant back that way, so if there isn't too much rot, hold that H2O2 spray). If you don't have any media for potting up for a week, you could just put in a mason jar or a vase with the roots hanging in and leaves resting above the neck. Give the roots a good spray of water every day or whenever they seem dry (white opaque vs. green or white translucent when hydrated). Pot it up when you have the media. Better grow orchid bark potting mix at HD or Lowes should be a good choice unless you are in hot climate where you may need more sphagnum moss in the mix. Good Luck. I don't know about the food. Reuse it if the rot is not too bad. Use it for some other plant if in doubt.

It also came with a baby bio food popped into the top of the medium

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i dont know what that means.. so its hard to opine on it ...

any chance at a pic???

ken

ps: you dont mean a fertilizer stick do you????

That's what I thought. Then I searched and sure enough Baby Bio Orchid Food Drip Feeder | Solabiol

I would stay away from giving the orchid any food for a while while it recovers from root rot.