Activate one of the items to be combined, then right click the second and choose combine. Only basic item type matters - a scrap of pinewood q30.00 wt1.50 will combine with a scrap of olivewood q80.00 wt0.50. Metals such as [[Iron lump]] need to be glowing hot for a combine to work.
You can combine multiple items by activating one, highlighting the rest (shift click or control click) and selecting combine. The activate one can be highlighted or not.
== Storing Water ==