I have just recently switched from the standard Aptamil to Aptamil Comfort. Does anyone know if I can still use the Aptamil ready made cartons on days out? If not, how can I bring my LO's feeds for the day with me? I currently half prepare bottles in advance by boiling half the water needed, rapid cooling it and leaving it in the fridge until needed when I top up with the other half of freshly boiled water and add formula. I have a cool bag which is good for 4 hours. Thanks.