I took Scoot Before.
1) yes can bring milk powder.
hot water and cold water also no problem. as long you are carrying baby and the backpack as you walk thru the gantry
2) Cannot put in bassinet when take off.
Not even in baby carrier. Not allowed.
3) never encounter before. I always hope and pray my baby poop before flight. :D
4) i use a cabin size stroller. i bring it on flight with me
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