^^^ true. I used a nasal spray bottle and crushed up a few diluadids and added it with distilled water. It does absorb better, resulting in a better high than just snorting it as a powder.
On a side note, I emptied a gram of high quality cocaine into a nasal spray and it worked amazing, way better than simply snorting it. First, I added the cocaine to a appropriate amount of (distilled) water, then when the coke disolved into the water and the cut seperated, I filtered it through a coffee filter, leaving a fairly pure solution of coke and water. Then I added the coke-water solution to a nasal spray bottle. It was an amazing high, and I could do it anywhere without suspicion.
The reason it works great with coke is because( as many know), it is highly water soluble.
Heroin, if I am correct, will dissolve very well in cold water (following the principles of a CWE). Try and dissolve the heroin into a cold water solution and then filter it through a filter of some sort. It should in theory leave you with a fairly pure solution of heroin and water which would then be transfered into a nasal spray bottle with great results. Like I said, I've tried this with Dilaudid and it worked out great.
On a side note, I would never share a nasal spray bottle with anyone. Studies have shown that sharing bills and straws have a similar rate of cross-infection of diseases (hep c, hiv, etc.) as sharing needles. The same would apply to a nasal spray bottle, which would get pretty filthy of you shared it with a few people. How's that for harm reduction? Good luck, you should post your results.