To help you out, you need to use the walls that block solids and gasses, but allow liquids underneath an e-wall which in turn is underneath a large tank of oil. Use a spark or something to detonate the oil, allow it to escape through an exaust pipe while also allowing it to heat filter (fastest heat conductor)
This then heats up a barrel full of water which can be either refilled via any mechanism you choose or simply clone, however water delays and wifi will be used. It's mostly up to you as to how that works however.

use Portal in/portal out, that always works for me