I know that you can get some decent knives for cheap, but I have never seen a whole kit for $10. I soggest if bulk isnt an issue,

A ITW Nexus Sea Whistle, they are bright and loud, and clip on clothing.

A knife with a 3" blade or longer, like this one.

A couple of zipLoc bags with the expandable bottoms, I can send you a couple.

A nalgene 1 Qt. bottle, it can hold all of this and it's definately waterproof!

A coulpe of Katadyn tabs.

A bandana, on your person, bright orange or red, I can send you an orange one.

Paracord, I carry 12' enough for most tasks, And some more essentials, I am too lazy to list but all can be acquired cheaply.