Anyone know how to prepare this for lo?

It is actually quite simple. You just have to add milk to it. For eg about two tablespoons of rice cereal powder you add roughly 60ml milk. Adjust accordingly for the consistency you want. Rice cereal tend to get dry as you feed the baby so I will always make alittle moe milk to add in when necessary. Some people add hot water only instead of milk.

Just add EBM, milk or water and mix to the consistency you want. For starters, you may want to make it more watery. Once they get the hang of swallowing, you can thicken the mixture :)