Preheat the oven to 350 degrees. Line cookie sheet with parchment paper or nonstick baking mats. In a large bowl mix melted butter and both sugars. Dissolve baking soda in water and add to mixture. Add peanut butter and eggs, mix well. Fold in chocolate chips, raisins, and oatmeal. Drop by the tablespoon two inches apart onto the prepared cookie sheets. Bake for 8–10 minutes.