Preheat the Dutch oven with 24 coals underneath.
Fry the bacon in the Dutch oven, and then remove.
Cook the zucchini with a pinch of salt in the bacon grease.
When the zucchini is getting soft, add the tomatoes and cook until they start to break up. Remove the vegetables from the pan.
Add the water and the pasta to the pan, plus a Tbsp of salt. Stir and cook covered, adding some coals to the lid.
Check and stir periodically until the pasta is done; there should be some water left, this is good high starch water that will make a nice smooth sauce with the added pesto.
Add the pesto and stir and heat through. If the sauce is still too loose, let the pasta simmer uncovered until it thickens up.
Add the zucchini, tomato, and bacon back; stir and allow time to heat through.
Sprinkle with the parmesan and stir through.
Taste and adjust for salt and pepper.