1. Prep the oven to heat to 350F, and while it does, take the ham out of the package. Keep the glaze packet aside and discard the remaining wrappings. Then, wrap the spiral ham in aluminum foil, and set it in the preheated oven.
2. Cook the ham at 350F and frequently check for a minimum internal doneness temperature of 140F. This should take about one to one-and-a-half hours.
3. Once the internal doneness is reached, set the ham down and place a saucepan on the stovetop. Then, combine the glaze packet contents with the water in a bowl, and add this mixture into the pan.
4. Set the heat to medium and cook the glaze for about two minutes to a boil. Then, set it down and brush it all over the ham, ensuring to touch between the slices.
5. Increase the oven temperature to 425F, and bake the glazed ham for 10 minutes, so the glaze caramelizes over the meat. Then, set it down and sit for 10 minutes before serving.

More ideas for cooking Kirkland spiral ham can be found here.