Junie,
My reply as follows:
1. Yes, you can buy those rice cereals for 6mth onward.
2. I started out with 1 tablespoon of cereal and mixed with milk till the consistency which my boy like (he doesn't like cereal to be too watery). Then after 4 days, I increase to 2 tablespoon, and now he is on 3 tablespoon of cereal. As for milk, I will still give him the lesser milk so instead of 180ml, he drink 150ml if on 1 tablespoon of cereal. Then slowly, his milk for lunch will be replace by the cereal liao.
3. Like what vernie say, I use my milk powder holder to hold the cereal lo and make it outside lo. I will also bring along a bowl and a spoon and his portable high chair seat. Quite abit of things to carry.