I spoke to an aquantance regarding curing bacon and he told me he did his own too. The only ingredients he used were salt and sugar - 2 parts salt, to 2 part sugar. Similar method too - coat pork belly with cure - then put in fridge and drain each day and re-cover with cure. It takes 5-7 days using this method.
I suppose the only danger here is bacteria - though he has never had a problem. Not using nitrates, the bacon seems to go darker too (which isn't bad).