hi scribbling
please give me your gynae's number. just as long as i get an appointment by august

are you coming to des tomorrow?
as for the formula...i was helping with triplets who did exactly the same thing. sometimes only have 30ml and other times 100ml. so what the mom does is:
make a 120ml bottle. and they drink as they want every 3 hours. so they can have as much as they need but only get fed every 3 hours. the bottles are just closed with the lid and set aside for the next feed.
she use to store the bottles in the fridge but now it's winter it's too cold (as she doesnt want to warm bottles) so they just stay on the kitchen counter.
the little one sometimes only finished that 120ml after 3 feed, so 9 hours.
personally I feel that is too long.
if you are going to re-use formula, keep it in the fridge between feeds and do not keep it longer than 4 hours. that is my opinion. others say as long as it's in the fridge, it's fine for 12 hours.
see what you are comfortable with