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 activated one can be highlighted or not.
== Storing Water ==