We used to use the FunTainers but changed to BPA free Polar Insulated water bottles after my kids cracked their Funtainers by dropping them! The Polar bottles works so much better!! You can even fill it up 1/3 of the way and freeze them if you want before filling them with water, plus they hold more water then the FunTainers.
I got mine on
amazon and got a different color for each member of the family! We have had them for 4 years and they have held up wonderfully...taking all the abuse my kids can dish out and my 4y.o. uses his every day and has been for the past 2 years!

Plus they are made in the USA!
http://www.amazon.com/Polar-Insulated-Water-Bottle/dp/B000F7Z0KI
Polar Bottle is the original insulated plastic sport bottle and has been keeping liquids colder, longer, since 1994. The bottle has evolved in the years since with brightly colored foil liners and patterns and an innovative removable valve system. Made in America, Polar Bottle is popular throughout the world.
Combining the thermal properties of an insulated vacuum bottle with the lightweight, flexible features of a plastic bottle, Polar Bottle's insulated water bottle is the ideal choice for active people. Simply fill with liquid and ice and hit the trail. For even longer cooling power, fill your insulated bottle and store it in the freezer before use. Either way, it will keep liquids cold twice as long as conventional water bottles.
Insulated Technology
The double-wall construction of our insulated water bottles creates a thermal barrier of air to keep heat out and cold in. Foil layers reflect solar rays for additional thermal protection.
BPA-Free & Phthalate-Free
Polar Bottle has never used BPA in any water bottles. Even the first Polar Bottles in 1994 were BPA-free.
Features:
* 100 percent BPA-free and Phthalate-free
* Double-wall construction; a thermal barrier of air keeps heat out and cold in
* Foil layer reflects solar rays for additional thermal protection
* Constructed of low density polyethylene, a durable, lightweight and FDA food grade approved material which complies with the Consumer Product Safety Improvement Act of 2008 (CPSIA) as well as California Proposition 65
* Fits standard bicycle water bottle cages
* Removable carrying strap so you can take the bottle everywhere
* Wide mouth allows ice cubes easily into the bottle and makes cleaning easy
* Urethane drinking valve is removable and replaceable
* Dishwasher and freezer safe
* Made in the USA
Specifications:
* Fluid Capacity: 20 ounces / 24 ounces
* Bottle Weight: 132 grams / 144 grams
* Height: 9 inches / 10.5 inches
* Diameter: 2.95 inches / 2.95 inches
Product Description
Combining the thermal properties of an insulated vacuum bottle with the lightweight, flexible features of a plastic bottle, the Polar Bottle® is the ideal choice for active people. Simply fill with liquid and ice and hit the trail. For even longer cooling power, fill your Polar Bottle® and store it in the freezer before use. Either way, it will keep liquids cold twice as long as conventional water bottles.