Hi Deanscroft. We bought sterlising tablets(not Milton though) in the local pharmacy and bought a washing up
bowel to put all our grandson's bottles in. Did the job perfectly..Just needed to soak for half an hour and the solution lasts for 24 hours

Mind you they were a lot more expensive than in the uk so I would take them with you as they wont take up any space in the luggage.
Hope this helps!