Just download the flit keyboard apk and copy it to your watch via PC and then install with file manager.
P.S before posting such questions ,search these forums a bit first( just an advice.)
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CURRENT DEVICE: LG OPTIMUS 4X HD
ROM: BEANSTALK [4.4.2]
KERNEL : iodak v9
SUPERCHARGED HTC EVO 3D
HBOOT: S-OFF Revolutionary 1.49.1107
ROM: CM10.1 UNOFFICIAL
KERNEL:Anryl/Johnnys CM kernel