Instructions
Purchase animals at the market. Saltpeter comes from completing the Manure Collection, which consists of poultry puddin', piggy poop, brush brownies, prairie piles, and meadow muffins. Geese and chicken produce poultry puddin', pigs produce piggy poop, goats and sheep produce brush brownies, horses and mules produce prairie piles and cows and oxen produce meadow muffins. The more animals you purchase, the better your chance of completing the collection.
Complete the Manure Collection by feeding the animals each day. Visit your frontier and click on the animals to do this. Eventually, the animals will produce a component of the Manure Collection. Feed the animals several times a day to complete the collection faster. Once you complete the collection, the game notifies with a message that pops up on the screen.
Cash in the Manure Collection to receive the saltpeter, which allows you to create fireworks for display on your frontier. Click on the button on the message that pops up to notify you of the complete collection. At this point, you'll have the saltpeter.