I'm planning to start a coffee shop business at a retail space and am trying to reduce the cost of contruction at minimum. I want an advice on how to install the plumbing line from my sink to a drain (if there is one available/or whether I must make a hole on the wall) in a typical retail setting like this. Also, how do I setup a water heater if I want hot/cold water coming out of my sink faucet? I'm a complete newbie in plumbing. Thanks.