I have recently travelled in secunderabad visakhapatnam vande bharat and seen all passengers served 1 litre bottles. Most seemsl to be consuming either 1/2 or 1/4th bottle and wasting water. Price can be reduced of fare and passengers provided 500 ml water and railways can make more profits. Likewise also ,provide extra bottle if any need further. Likewise food wastage may be avoided in trains ask for reduced food , if not in position to consume entire portion. Thank you