While cherries bake, put dry ingredients for topping in a food processor fitted with the stainless-steel blade. Pulse a few times to combine. Cut butter into about 4 pieces and add to food processor. Pulse machine until the mixture resembles coarse sand, and then transfer it to a medium bowl. Combine water and almond extract, and then pour over flour mixture. Stir until just combined and nearly smooth. Stirring any more than that will give you tough biscuits.