Yes it's 300 ml of full fat cows milk per day from 12 to 24 months and that includes any milk used in cooking, cereal, rice pudding, cauliflower cheese etc. so no need to carry milk, just take water and snacks
With DD1 I continued to take the individual bottles of formula out and am just moving onto that stage with DD2. At the moment I can take cows milk as it's so bloody cold but normally I would take little bottles of the toddler milk.
I don't give my 14 mo DTs anything other than tap water during the day. They have cows milk on waking and before bedtime (and teeth cleaned afterwards of course) but they don't seem to want/need milk during the day. Or the odd babycino