Cook and stir the garlic and bell peppers until they are cooked-through. Remove from the heat.
Mix coconut milk, water, flour and half the crabmeat and puree in the blender. Add this mixture to the pot with the bell pepper and garlic.
Return the pot to the stove and simmer over low heat until liquid has reduced a third, stir often to prevent it from sticking to the bottom. Add the remaining crabmeat and simmer for another 5 minutes. Season with salt and pepper to taste.