sweet potato plant

Hello,
I wonder if there is any advice out there to revive an abused sweet-potato plant?
I sprouted a sweet potato in water for a few weeks. It was lush and healthy with long roots. Pressed for time, I bought soil at Home Depot -- where I only found a bag of Miracle Gro for Vegetables and Gardens. The sweet potato suffered heavily. The tuber got mush and the leaves shrivelled. I had to put it outside because my partner reacted strongly to the Miracle Gro as well.
It was a few days before I could get organic non-chemical soil and replant the tuber. I washed the leaves and root, repotted it, and returned it to its spot in the warm kitchen. Still, the sweet potato is dying and this is sad.
Is there anything I can do to help it out? Any nutrients? Treatment? I am an amateur (clearly) and would appreciate any advice.
Thanks, Liron
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You need to pull the plant from the potato. Sweet potatoes are planted using 'slips' which are the plants pulled from the potato. The potato that the slips are taken from rot away in the soil.

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Thank you.

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