Yes i started with mashed banana..after that daal ka paani & sooji kheer..now i started cerelac

No problem and nothin to worry.. slowly u have to introduce everything to ur baby... you can give other things also at home like daal ka pani or rice ka pani or suji kheer it mashed banana or puréed fruits and vegetables

You can make it watery. No prob. Also, have you also started giving your baby semi solids such as mashed and pureed fruits. I'll ask you to do that too along with cerelac.

Do we need to prepare as per the measurements given on the pack ? as the mixture was very thick when i prepared as per the mentioned measurements

No it's okay dear.