I think Heinz Rice cereal has been out of stock in Singapore for a long time
Nestle rice cereal contains gluten and sugar which I was unwilling to use for my baby's first taste to solids.
I use Healthy Times Brown Rice cereal.
For Healthy Times, no need to cook. Just mix with FM or EBM. The texture should be creamy, not lumpy or too dry.
Solids is best introduced at a time when baby is most awake (usually that's lunch) and not too hungry.