Preheat oven to 400 degrees.
grease a 12x8x2 inch baking pan.
Cut zucchini in halves lengthwise, and scoop out pulp (use a grapefruit spoon if you have one), leaving a 1/4 inch thick shell. Chop pulp and set aside.
Place zucchini shells cut side down in a large skillet Add the water, and bring to a boil. Reduce heat and cover, and simmer until just tender, 4-5 minutes. Drain shells and place cut side up in the baking pan.Sprinkle with the salt.
In the same skillet, melt the butter and saute the zucchini pulp and the tomato for 3 to 4 minutes.
Remove from heat and stir in the bread crumbs, cottage cheese, egg, parsley, onion, basil, garlic, pepper and a little salt. Spoon mixture into the shells.
Cover and bake for 20 minutes. Remove cover, sprinkle with cheddar cheese and return to oven for 3 minutes or until cheese is melted.