DS2 is 6mo and has x1 bottle of formula at bedtime, from a Tommee Tippee bottle. Obvs we usually sterilise this lonely bottle every day. But we're off for x4 nights tomorrow, staying at 2 different houses. Apart from boiling for 10mins is there any way to sterilise the bottle without taking the ENORMOUS steriliser? Do I need to bother at this stage, when he chews all sorts of unsavoury items bought to him by DS1?