I use the brown bottles I get for free from my pharmacist in witch the homeopathic tinctures are coming. As these products are no chemicals, not hazardous nor reactive, and can easy be diluted in water, these bottles are clean just by rinsing a little with hot water. I get then in 0,5 l, 1 l, 2,5 l and the large ones have wide necks.
To stop the developer oxidising by the air, I blow a little CFC free KENAIR air duster in the bottle just before closing it.

Philippe