re small bottles, my ds4 wasnt on them long at all, but my dd used them for ages as she never liked more than 4oz of milk at a time, so will depend on your baby.
most brands avent, tommee tippee etc do started packs of bottle sand teats and usual they contain a bottle brush as well and they seem to have 2 little and 4 big bottles in them? or they did when i bought them.
re making up milk a cheats method that still uses 70 deg water is to have 2 bottles ready for feed, one sterilised and EMPTY the other sterilised and with pre-cooled boiled water in, say half the amount you need for a feed ie 3oz of a 6oz feed. then when its feed time put the other 3oz of HOT 70 deg water in the empty bottle add ALL 6 scoops of powder, shake well to ensure its mised and then tip in the other 3oz of water from the other bottle, as this is cold it will cool the feed dow quicker :)
you MUST measure the amounts of water carefully and add the powder to the HOT water and then top it up with the PRE-MEASURED cooled boiled water, so you get the right amount of water/powder :) but this works well esp at night time to get a feed at the right temp quickly.
you may need to experiment a bit with the amounts of hot/cold to see what gets it the right temp but its generally 50/50 or 1/3 hot and 2/3 cold :)
and it is ok to make them in advance as long as you cool quikcly ie under a running tap in a bowl of water, and then refrigerate, to warm i just stood them in a jug of hot water, but when doing the half hot/half cold method you don tneed to warm as they are the right temp :)