Hi we just did a quick trip to melbourne and back in 3 days from Canberra with a 4.5month old and it went well. If there is someone in the back they can always play with bub when they are awake this is what we did. It added only 45min to each trip with the stops to feed (my bub is a fairly quick feeder), we also took the opertunity to have streach and wee stop at that time.

I would take a few small toys that bub likes with you in the car.

We have had two unsettled but not realy bad nights since getting back but other than that she settled back in fine, were about to go to sydney tomorrow and back on sunday so poor girl will have done two long trips in two weekends.

I did not bother with bottle or anything.

Hope this helps.