What are the recommended boiler or cooker which I can use to cook porridge at work and bring home in time to feed baby? TIA

I tried a new method shown in channel 8 to cook porridge in 15mins. U may want to experiment once? I wash and drain the grains, pop them into the freezer overnight. The next day, I just dump in ingredients of my choice, boil for 15mins and it's done. Definitely saved me a lot of time, electricity and gas!