Fizeau’s water experiment found no movement of the Earth. Neither did the Michelson-Morley effort of 1887. For Einstein, Relativity became an imperative premised on the supposed anomaly he found between Maxwell’s electromagnetism and mechanical motion, namely the lack of the Earth’s mechanical motion.

To explain heliocentricity Einstein had to contend with the failures of the Fizeau, Michelson and Airy experiments on the one hand, and with the widely accepted aether and electromagnetic theories and equations of James Clerk Maxwell on the other. After 1887 he had to reinterpret these catastrophic failures to save the Copernican phenomena.

“It is no doubt that Michelson’s experiment was of considerable influence upon my work insofar as it strengthened my conviction concerning the validity of the principle of the Special Theory of Relativity.”^{2 (March 17, 1942)}

The above statement is classic Einstein. He purposefully misinterprets what the Michelson-Morley (MM) experiment actually found and tautologically declares that as supporting proof for his mental gymnastics!   More here