Milton Solo can be used either as a cold water steriliser or as a steam steriliser. 1 x Milton Solo Travel Steriliser. 1 x Milton 40 sterilising tablets. To use, either put in the microwave for 2 minutes with 60ml of water or fill with 1.25 litres of cold water and 1/4 of a Milton Sterilising Tablet and leave for 15 minutes.