:3) Build your forge next to one of these new magically refilling fountains. This is the best option, but having a big fountain in your house looks a little silly. This option is like a natural spring or indoor plumbing ;)
*When improving several things at once, apply lump to them all together until they all require a different item, then put the lump back in the forge and imp them all back to needing lump again. this is because lump needs to be hotglowing, so you want to get through it's use quickly.
*It's also useful to have 2 lumps for imping, so that you can switch if one cools.