For the dough: Mix the glutinous rice flour using your fingers until well mixed. Add water, a little at a time, and knead until a dough forms. The dough should be soft but not sticky or tacky. If it becomes sticky, just add a little more flour and knead until it no longer sticks to your fingers.
Turn the dough onto a cutting board and pat it down into a rectangle a little less than 1 cm thick. Cut the dough into 1 cm-thick strips and separate the strips so they don’t fuse back together. Take each strip and cut them into 1 cm-long pieces so that all your pieces are now roughly 1 cm cubes. Roll each piece either between the palms of your hands or the tips of your fingers so you have little balls.
When all the balls are rolled, keep them wrapped tightly in plastic wrap if you are not ready to cook them immediately so they don’t dry out. Bring a pot of water to a full boil, and while waiting for the water to boil, make the sweet coconut milk.