Dave
We're not that mean that we'd let you waste your money - keep the cure - we'll have you making your own bacon in no-time. It'll be better than anything from the supermarket.
To return to your problem, we know that kids like the cheapest rubbish sausage available. They prefer the 50p a pound stuff over award winning produce any day of the week. It's the nature of the beast!
You will have gathered that Ascorbic Acid is the way to go - you should be able to get this from the chemist as powdered Vitamin C.
If you can tell us where you are, guys that live near may be able to advise.
Once you're set up with the Vit C post again (or if you have difficulty getting the Vit C do the same), and someone will work out how much to use for you.
Phil
(edited for spelling 'cos I've been to the pub!)