Zombie soldiers are not special. Special zombies are acid, brutes, shockers, smokers, gasbags, etc - zombies that do something weird, not just zombies that did in better clothing that some random citizen.
You will need a drill to put in a maple spile. You can make forged goods during an innawoods playthrough, it’s just tricky:
- Learn Fabrication 3 and collect a pile of rocks. Construct a charcoal kiln. Fill it with wood, you’re going to need a lot of charcoal.
- Learn Fabrication 4 and collect a pile of rocks and clay. Construct a clay kiln and load it with some charcoal. Make a clay crucible.
- Learn Fabrication 5 and collect a pile of rocks and a huge pile of metal. Construct a rock forge, load it with charcoal.
- Make a hammer, anvil, metal tongs, metalworking chisel, and swage and die set.
- Make whatever the heck else you want.
You started in a swamp shack, so you already have the charcoal kiln. I don’t think the other resources in a swamp shack are enough to make an anvil (which is like 2 HD frames IIRC) so you’ll have to find a lot of wreckage, but it is possible. You can also use small and medium boulders as basic anvils, apparently.