Preheat your oven to 375°F (190°C) and line a baking sheet with parchment paper.
In a mixing bowl, combine the flour and salt.
Gradually add the water to the flour mixture, mixing it until it forms a stiff dough.
Roll out the dough on a floured surface until it is about 1/2 inch thick.
Using a knife or a biscuit cutter, cut the dough into small squares or rectangles, typically about 3x3 inches in size.
Place the cut pieces on the prepared baking sheet, leaving a small gap between each piece.
Use a fork to poke several holes into each piece of dough. This helps prevent the hardtack from puffing up while baking.
Bake in the preheated oven for 30-40 minutes or until the hardtack turns a light golden brown.
Remove the hardtack from the oven and allow it to cool completely. It will harden as it cools.
Once cooled, store the hardtack in an airtight container or vacuum-sealed bag to maintain its shelf life.