ambery,
1) u can add a bit more water but not more powder. it shd b 180ml water, 6 scoops of powder. or u can put 180ml water, approx 5.5 scoops powder.
2) fm tin is a gauge only. some bb drk more, some drk less. since faith is 1st tx starting on fm, 150ml + 5 scoops shd b enough. note: bm is more easily digestible, if 140ml bm is enough, then 150ml fm shd b sufficient as a start.
3) start w nan1. in fact infant/stage 1 fm can take all d way till 12mths old. 6mths onward fm usually contain higher amt of protein but some bb do not digest tis cow milk protein well. ash is 1 of them so he took d stage 1 fm all the way till 12mths old.