After Denny's article in the spring issue of Zymurgy, I'm anxious to experiment and split batches for experimentation with yeast pitching rates, strains, fermentation temps, and adjuncts.
I had previously done this by doing a high-gravity mash, spitting the wort into two batches, diluting to session levels pre-boil, then changing hop additions.
What are some good containers to use for 1 gallon mini-batches? I have one one-gallon glass jug (likely from a nasty jug wine or something) that I used to use for starters. I also have about 3 extra 5-gallon carboys that I picked up when I thought I would do a lot of bulk aging.
Two questions: 1.) Is extra headspace in a fermenter bad? I could theoretically just use these 5-gallon carboys if not 2.) What are some other suitable containers that people have had luck with in finding inexpensively and readily available small fermentation vessels?