I was playing around with cakes in creative in the water when I realized when I went into the water I started flying. I played around with it and you don't need anything. Just walk in the water and it triggers fly mode.
Linked issues
Comments 2
Reproducible in v0.10.5 on Android 4.4.2 in Creative mode.
This is a specific case of https://bugs.mojang.com/browse/MCPE-6806 which describes flying mode becoming enabled (when it shouldn't be) simply because the player moved from a slab (such as cake in this bug report) to water (stationary or flowing).
To reproduce:
1) find or place some water when in creative mode
2) place a slab so it is adjacent to the water
3) move the player onto the slab and ensure movement mode is non-flying
4) move the player off the slab into the water
5) observe that the movement mode has changed to flying mode.
Cleaning up old issues, please reply if affecting 0.9.3