Hardtack
Hardtack is survival food & may be kept aboard for years.
The fixings for Hardtack are;
2 cups Flour3/4 cup Water
1 1/2 tsp Salt.
Mix & knead with a rolling pin. Form 3" squares, perforate & bake for a half-hour each side.
When cool, store airtight.
Soak to soften, in stew, soup or similar, for 5 to 10 minutes before eating or you'll become a gummy old pirate.