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Preheat oven to 350 degrees. Line two baking sheets with parchment paper; set aside.
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In a large bowl, using a spatula, cream together butter, sugar, and salt. Add egg, vanilla, and 1/4 cup water; mix until well combined.
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In another large bowl, mix together flour, oatmeal, cinnamon, baking powder, baking soda, and nutmeg. Fold into the butter mixture until well combined. Add raisins and stir until well combined.
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Using a 1 1/2-inch ice cream scoop, scoop out cookie dough onto prepared baking sheets, about 1 1/2 inches apart. Transfer baking sheets to oven, and bake until edges begin to brown, about 20 minutes. Let cookies cool on baking sheet for about 10 minutes before transferring to a wire rack to cool completely.