easy ......

Open the Photon microlight, remove the batteries and the circuit, leave the LED(so that end is closed) and use this improvised container to boil a few cc (?!) at a time.
Advantage : such a small qty you can drink it hot , no need to wait for cold water ....
<img src="/images/graemlins/grin.gif" alt="" /> <img src="/images/graemlins/grin.gif" alt="" /> <img src="/images/graemlins/grin.gif" alt="" />