How to homogeneously mix a very small quantity of a salt in a very large quantity of another salt?

I'm trying to recreate `super salt` which is a mixture of:


* 90 parts `NaCl`
* 10 parts `Monosodium Glutamate`
* 1 part of `disodium 5'-ribonucleotides` (1 part `disodium guanylate` and 1 part `disodium inosinate`)


Anyhow this means that only 1% of final product is made of `disodium 5'-ribonucleotides`, which is usually a rounding error in my recipes.
How could I make sure that I have an homogeneous mixture of the 3 ingredients?


Solutions I thought:


* Mix them in an empty bottle and shake for 30 minutes
* Die the `disodium 5'-ribonucleotides` and visually check that an homogeneous solution has been reached
* Create a oil / water based slush? (I think it's a bad idea)


Is there a better approach I could use to achieve my desired result, without buying any expensive machinery?


