Cook ground beef until no longer pink, breaking up into fine pieces with your spoon. Drain fat & put in a bowl.

Add refried beans, taco seasoning, & ½ cup cheese to the cooked meat. Combine well with a spoon/spatula.

Fill dry manicotti shells with filling. You may use a zip-top baggie & cut the corner to squeeze the filling into the shells. I actually just used a spoon & would shove the filling deep inside with the handle of the spoon. There is a lot of filling, so don't be shy. Fill them up well.

Combine the green taco sauce with the warm water & pour a layer on the bottom of a large 13x9" rectangular glass baking dish. Place the filled manicotti shells over the layer of sauce. Pour remaining sauce on top of shells. Sprinkle with ½ cup cheese.