InstaCure aka Prague Powder for Curing Meats?
A common FAQ seems to be "Can I substitute Morton's Tender Quick" for these.
The answer seems to be "not necessarily".
Excellent FAQ here on these curing salts, nitrate, nitrite, etc...
And if you are wondering, I am trying to make my own bacon for the first time. I have some lovely Kurobuta pork belly and am using a recipe from The Ravenous Pig that calls for 1 tsp for 1.5 lbs meat.