You need to use short grain pearl rice. If you can´t find this you can use sushi rice or risotto rice. Don`tt use long-grain rices like basmati, they do not form the stickiness needed for porridge.
Cook the rice-water mixture on high heat so it starts to boil. Next, reduce the heat to medium so it simmers. Cook it for about 10 minutes and stir once in a while.