I have seen an instructable on this and I thought I could make it easier for you... http://www.instructables.com/id/Ultra-Lightweight-Backpacking-Spice-Kit-only-1oz/
The same principle but the closing of the straws is with fire... That makes it faster and probably more secured.
This are waterproof and you can seal them again if you have some heat source when you are camping (like fire! match, or lighter).
have fun and enjoy it!
Step 2: How to close the strwas with lighter
Just don't put it into the fire... just close enough so it get's hot enough... then close them with your finger... if you are scared of doing so... get your fingers cold in the freezer then do it!
Don't burn anything!!!
Step 3: Final Product!
Now make as many as you need!
I managed to make one with oil!!! just be careful cuz it might light up... it's quite flammable... do it over the zinc and you'll be safe!!! happy filling!!! You can put vinegar, oil, lemon, and whatever else you use or like!!!
Enjoy your meal!!
One last thing:
The easiest way to open them for use is also with a lighter... you just heat it up and it pops open!!
God bless you all!