Here it is. It seems to be a stupid price on amazon at the moment but pet shops sell it as well. I’d get two bottles as I used one up by dowsing things.
https://www.amazon.co.uk/Beaphar-Dee...4069693&sr=8-2
As for the food - either chuck the bag or put it in the freezer. Persionally I’d chuck that bag and put a new bag in the freezer. Obviously you still need to feed him but you can just take a bit out of the bag in the freezer. Although I leave it a week to make sure anything is well and truly dead, a spoonful is probably fine after 24 hours. And a new bag may be fine anyway.