I used glutathione for our shared condition bronchiectasis. Theranaturals (link below) is where I purchased. I nebbed the powder from capsules, and also used it sublingually. I went through about 2 bottles and then started to take NAC instead, which is a precursor to glutathione. NAC is easier to take than nebbing glutathione. Glutathione is destroyed in the stomach so really doesn't do much good swallowing pills. After quite sometime I stopped NAC also. I cannot say I am better or worse. I've read medical studies both yea and nay about its benefits.

Regarding a nebulizer for glutathione -- I used to use Innospire Go for glutathione. I would imagine any nebulizer would work for nebbing it. Once you open the capsule it kind of bubbles a bit, dissolves and then you neb. If you want a reliable portable you'll need to spend some money -- check out eFlow by PARI. Hope this is helpful. I posted about this awhile in this forum. Search glutathione.
https://www.theranaturals.com/product/reduced-l-glutathione-plus-enhanced-absorption-ultra-purity-grade/