First I built a small support city that only had waterpumps and garbage landfills(not a functional city) then, right next door, I built a large master city (million+) without waterpumps or garbage landfills. Then, when playing the large city, I set a neighbor deal to get all water and garbage services from the small support city. After everything was set up and running cool, just for fun I canceled the neighbor deal and in the same screen sold the water back to the small city for 800,000 simolians per 1000 of water. I have manipulated this glitch to pay my master city over 3 million every month and still buy the water at regular price! It only works for a few months, but all you have to do is set the deal again. HA!