under sink

Our house is slab on grade and there was no existing dish washer. The sink drain attached to the drain pipe but then the drain pipe goes up and over and down again. In wondering if where it goes down into the slab is another drain outlet and if I could just plumb the dishwasher drain into there...

Hi - I'm in an apartment with an old kitchen faucet (madeira?), and there's no under-sink shutoff valves for hot or cold. It goes straight into the wall. I'm wondering if I can still install an under-sink filter (i.e. Aquasana) and hook the cold water line somewhere in the small space between...

I want to install a drinking water filter system under my sink but it looks very cramped and I don't know which pipe to take the water from. Can anyone advise please? I was planning to use this Everpure filter but I'm happy to use another if this is too fiddly...