I've been home beer making(didn't say brew as I only use the Coopers cans) for about a year after a layoff of about 15 years.
I bought the Coopers kit as my old black carboy was well rooted.
A few musings follow
I don't worry about the airlock not bubbling any more.You get paranoid if nothing happens which happened on a couple of brews.Luckily I had read that it didn't necessarily mean that that was no fermentation.I now leave the airlock on the lid permanently and give the combined top a bloody good wash and sterilise with no worrries so far.
I use a combination of the pet bottles that came with the kit,as many glass 750ml ones as I can get my hands on and old Crown lager,tooheys old and Coopers sparkling 375ml ones as back ups.What a bastard that they are all different heights .Last summer the next door neighbour gave me two large bottles that had home brew in them that his father had made.We worked out he had been dead for 17 years so the beer must have been 18 years old therefore too old to risk sampling so the plan was to tip out the beer and use the very sturdy bottles.You guessed it ,I cooled the buggers down and quaffed them and they were alright and I obviously didn't cark it.
I also use the 2 litre pet coke bottles at a pinch but nowadays reserve those for cider as my missus didn't see the funny side of putting my beer(Coopers old)into her bourbon one Friday night.
Have to do some work now so will continue these musings later