How much of the ingrediemts would I need to double the following recipe.

How much of the ingrediemts would I need to double the following recipe.Sausage Zucchini Boats4 medium zucchinis1/2 cup water1/2 pound pork sausage1/4 cup chopped onions1 slightly beaten egg1/2 cup saltine crackers1/2 cup shredded cheese1/3 cup parmesan1/4 tsp salt1/4 tsp dried thyme1/8 tsp garlic salt1/8?tsp pepperpaprika