Lifestraw would work well with a SODIS system.
Carry the untreated water in a two liter clear pop bottle in the
sunshine and the UV will dispatch a good number of any bacteria in the water. Then the lifestraw would get any remaining.
FYI - a 2-page discussion on some of the negative aspects of using the SODIS system can be found in this thread:
http://bushcraftusa.com/forum/showthread.php?p=1045130#post1045130