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The water line should be 1/2" Pex. You could get a push on type fitting that will have a 1/4" female pipe threaded Tee that the water filter line can connect to at home improvement stores.
Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7