Preheat oven to 350°F. Grease two cookie sheets.
Cream butter and both sugars until fluffy. Add egg and beat thoroughly. Mix in water and vanilla.
Sift together flour, cinnamon, salt and baking soda; add to the egg mixture and mix well. Add oats and raisins, and mix.
Form cookies on prepared cookie sheets, following the method for giant cookies (see page 262). Bake for 15 to 17 minutes, until edges are done but centers are still soft. Remove to a rack and cool.