I poured a ready made bottle into a sterilised bottle for my baby as we were out and gave him that but 3 hours later we were still out o went to get another bottle as I usually always have 3 sterilised ones in my bag realises I didn't have another. I was at a friends not so close to home so I just washed it with soap and water, purer another ready made bottle in and gave him that as he was crying foe his bottle. He's 20 weeks old. I always throughly wash and sterilise his bottles so now I'm really worried it may do some harm. As a one off should this be ok?