So, I'm sorry, but I'm going to exercise some pedantry. I'll try to avoid confusing technical terms but not at the expense of precision.
It is unlikely you have found liquid sodium nitrite, as it has a melting point of 544 K (271C, >500F). That's extraordinarily hot, higher than the melting point of tin for example. What you might have found is a solution of sodium nitrite, probably dissolved in water.
The way people use solid sodium nitrite is dissolving it in water to form a solution.
You need to know three things:
- what is the solvent (the liquid the SN is dissolved in)? Is it water, or something else like methanol or ammonia?
- what is the concentration of the solution?
- what is the total volume of the solution?
If it is water, the concentration is similar to the concentration used in CTB attempts, and the volume is at least as high as the volume used in CTB, then yes, this should be usable.