Am thinking of getting 1. I know I can tap it under the sink but don't understand how I can get drinking water from it. Do I need another faucet for it? Also the unit must have 2 output right? 1 after RO (drinking) and 1 after DI (aquarium) and should I get a unit with a TDS meter built in? If anyone have pics for me to see and understand the setup that would be great. TIA Vincent.