Things to consider are the amount of water you need to sterilize and the weight of the device. [substeps] You may be able to find a small uv pen that sterilizes water, such as the steripen.
[header] How to use uv to sanitize water [title] Purchase a portable uv water purifier. [step] Portable uv water purifiers can be found online or at your local outdoor store. There are a few different models to choose from depending on what you are looking for.