Using warm liquids in MyHydrate should be fine, but you should avoid the use of extremely hot or boiling liquids. Drinking boiling or hot liquids through the spout can be unsafe.
Tritan® container: Do not boil the container and do not use with boiling or extremely hot liquids. Avoid temperatures over 120° F (50° C).
MyHydrate cap: Take care to not boil the cap and do not use for drinking boiling or hot liquids – the electronic smart disk is water resistant but not water proof. Do not immerse the electronic smart disk in water or it will be damaged!