My guess is the towels and bath mats he used to stop the bleeding.
The ones he replaced at his TJ Maxx trip
I can imagine him using the bath mats under her body and towels on her wounded area.
Move body to the basement with the child locked door and improvise with kitchen trash bags to protect the floor until he could make his shopping list and get the better supplies.
He would have had to addressed the rug that early evening also - wouldn't want the kids seeing it. I think it went in the basement until he had time to cut it up.
Personally I think he got rid of it later as he was too busy searching what to do so it wouldn't look like he did what he did.
He didn't get any sleep that night did he.