Cook the bacon in a large skillet over medium-high heat until crispy, about 6 minutes.  Using a slotted spoon, transfer the bacon to a paper towel lined plate, leaving the bacon grease in the skillet.  Drain all but 1 tablespoon of the bacon grease.

Add the chicken to the skillet and cook until chicken is browned and cooked through.  Add the taco seasoning and the water.  Heat to boiling.  Reduce the heat and simmer uncovered for 3 to 4 minutes, stirring until thickened.  Stir the reserved bacon into the chicken.

Heat the shells as directed on the package.

To assemble the tacos, add some of the chicken and bacon to each taco shell, as well as 1-2 avocado slices.  Sprinkle with cheese and cilantro and serve.