The question of how to get sufficient water to all the world's people will dominate the third World Water Forum, which begins Sunday in Kyoto, Japan...One of the most controversial topics participants will address is the question of whether water is a commodity or a basic human right. U.N. agencies and other international groups contend it is both, but the privatization of water companies has met with mixed success and has even created unrest, as when a revolt in Bolivia over Bechtel Corporation's doubling of water rates left seven people dead.