The best water bottle for a 3 year old is a water bottle such as CamelBak Kids Water Bottle.
Other good water bottles for a 3 year old are.
Zulu Torque Kids Water Bottle
Nalgene Tritan Grip-N-Gulp Bottle
Thermos Funtainer 12 Ounce Bottle.
For a toddler, the ideal capacity of a water bottle is around 300-350ml.
There's not much need for anything bigger as it'll be too heavy for them to carry.
A school age child should have a 500-750ml bottle.
This ensures they have enough water to last them throughout their school day.
Buying a kids drink water bottle is a good idea to help keep the kid supplied with plenty of water.
The kids water bottle will help keep the kid supplied with plenty of water and also help keep the kid from spilling the water.
Water is very important to everyone's health including kids health and a kids water bottle can help make it easier for the kid to drink plenty of water and stay hydrated.
To stay well hydrated, children ages 1-3 years need approximately 4 cups of beverages per day, including water or milk.
This increases for older kids to around 5 cups for 4-8 year olds, and 7-8 cups for older children.
Once kids have mastered drinking from a sippy cup then they can usually easily drink from a kids water bottle that has a pop up tap to it.
However even then they can still drink from a sippy cup as long as they are staying hydrated.