Tepco admits that the same water gauge that failed in #1 cannot be trusted in #2 and #3. And the Japanese nuclear scientist who has been very accurately predicting the Fukushima situation, way before Tepco even realizes or admits it, has stated that the same water gauges are failing in Units 2 and Units 3. So there probably is very little water in #2 or #3.
From TEPCO Presser on May 12 Part 3: "Probably the Same Situation in Reactors 2 and 3"