Water containers

 On any sort of excursion keeping hydriated matters and carriage especially for children can have issues recalling the ban on safety grounds of ring pull canned drinks on school trips lest you cut yourself so back in the 1970's nad early 80's we tended to us plastic beakers with an airtight sealed top.

Mini vaccuum flaskes tended to be reserved for hot drinks when you were a bit older.

Given the Scouts Association program is for four to six year olds, whose motor skills are still developing this is a simpel to use design with ribbed edges for better grip and a simple resealable cap  for drinking from.

This one is from Girlguiding UK and has only just been discontinued and aimed at 10-14 year olds so it's still a bit pretty, had a pull up straw for drinking from and well designed top.

The capacity is adequate although a group leader may have a master supply to top them up from if you might be a distance from anywhere.bur for everyday usage they're fine and easy to carry.