I'm using avent steriliser. it stays up to 6hrs as stated. if I'm going to be out the whole day, how? I can bring out sterilised bottles but I'm staying out more than 8hrs. how?

As for me, some shopping mall at children department or even restaurants they do have hot water so I will go ask for hot water to steriliser bottles. just beware some restaurants will want you to pay for the hot water. I tell them I making milk for my baby.