>>493945Container
Cordage
Cover
Get a good 32-48oz stainless steel bottle.
Get a lot of paracord.
Get a decent tarpaulin, an 8x10 nylon tarp is an indispensable survival tool, it can serve as a tent, a hammock, a rain cover, a wind block, anything. Don't be afraid to spend an upwards of $70 on a tarp.
A wool blanket is also a good addition depending on your environment.