I have no experience with the UV treatments, but I do carry these purification tablets, and they seem to work wonderfully, Taharmayim - Israeli Water Purification Tablets. (Though it sounds similar to chlorine it’s chemistry is different making it more effective than household bleach for removing viruses, bacteria, Giardia and unlike iodine, Cryptosporidium as well.)
I forgot, I use this portable filtration system when traveling abroad, and keep one in each of my B.O.B.s., they're only about $20. No filter to clean or remove, when the filter starts to slow down, just backwash, use once/twice, let dry, and its as good as new. Treats up to 100,000 gallons
Sawyer Products Mini Water Filtration System
The Sawyer Mini is ideal for outdoor recreation, hiking, camping, scouting, domestic and international travel and emergency preparedness
High performance filter fits in the palm of your hand, weighs 2 ounces and filters up to 100,000 gallons (30 times more than comparable filters)
Attaches to included drinking pouch, standard disposable water bottles, hydration packs, or use the straw to drink directly from your water source
Removes 7 log (99.99999%) of all bacteria and 6 log (99.9999%) of all protozoa
Sawyer's certified 0.1 micron absolute filter removes bacteria and protozoa at a higher rate than accepted EPA guidelines
The Sawyer Mini Water Filter is a second generation filter that is the lightest and most versatile personal filtration system from Sawyer. With a total field weight of 2 ounces it fits in the palm of your hand. This tiny filter does the same job that the Sawyer Point ONE filter does but now in a more compact, personal size. Filtering up to 100,000 gallons of water, this may be the last water filter that you buy. The Sawyer Mini filter is perfect for everything from camping with the kids to traveling abroad where tap and bottle water cannot be trusted. The filter removes 7 log (99.99999%) of all bacteria (like salmonella) as well as other harmful bacteria which causes cholera and E. coli and 6 log (99.9999%) of all protozoa such as giardia and cryptosporidium. These removal rates equal or exceed other filter options. EPA guidelines allow ten times more protozoa left in the water than Sawyer Point ONE filters allow.