Minecraft wiki entry for Building_micro_shelters, associated text: 14 solid blocks, 13 if you have glass (wood recommended)
2 temporary blocks (optional, dirt recommended)
2 chests
1 slab of any kind (wood recommended) and 12 (cobble)stone slabs.
1 bed
1 crafting table
1 or more torches (a dozen recommended)
glass (optional)
shovel (optional)
pickaxe (optional)