I don't like plastic bottles... but then again I am that crazy guy doesn't like sanitizing chemicals either do I use them, yes my milk comes in plastic bottles, so does half the processed food in my fridge, and yes I use sanitizing chemicals on things I can not easily boil, heck even my primary fermenter, for whole fruit wines is plastic. BUT when I have an easy alternative I take it. If you want to make small batches get some large wine bottles the 1.5L size. Any restaurant that sells wine usually throws out tones of these larger bottles every day and if you ask often times they will save them for you.
As to your question about smaller batches, I think thats a great idea. I have done the same in several 1/2 gallon jugs I have. Just keep in mind that the smaller the batch the more accurate you need to be with your measurements.