SQ/Carol: someone suggested for me to bring a mini slow cooker, (the smallest size one) but i think quite fragile cos heavy glass ware, if break, then cannot use liao. As for rice cooker, must wait for it to cook fully then can bring out. So the best solution is to buy a compact travel size thermal cooker and a small compact travel cooker hotplate, the thermal cooker has an internal pot for cooking/heating, boil porridge on ur travel cooker for 10mins every morning, then dump in the thermal cooker, bing out, and by lunch/dinner time,porridge/stew/soup will be cooked and ready for consumption.
That was also what pax did at sentosa. I also think this is the best way to go.