Dear Sir. Concerning your issue about the water content of water-saturated methyl acetate. The equilibri­um water content was 25 wt%. This was regarded as the reference state for particle size determination. I think the following below link and the attached file may help you in your analysis:

https://www.sigmaaldrich.com/technical-documents/articles/analytical-applications/karl-fischer/water-determination-in-ethyl-acetate-acetic-acid-ethyl-ester.html

Thanks

Thomas,

check the data about solutility in water - that is all you need.

regards,

G

Solubility of water in methyl acetate (25°C): 8.2 wt%; after: I.M. Smallwood, "Handbook of organic solvent properties", John Wley & Sons, 1996.