Data associated to the manuscript "On the structure of hybrid water-in-salt electrolytes"

The financial support of the Spanish Ministry of Science and Innovation (PID2021-126148NA-I00 funded by MCIN/AEI/10.13039/501100011033/FEDER, UE) is gratefully acknowledged. Moreover, this work was funded by the Xunta de Galicia (GRC ED431C 2024/06). This work was done within the framework of project HI$\_$MOV – “Corredor Tecnológico Transfronterizo de Movilidad con Hidrógeno Renovable”, with reference 0160$\_$HI$\_$MOV$\_$1$\_$E, co-financed by the European Regional Development fund (ERDF), in the scope of Interreg VI A Spain – Portugal Cooperation Program (POCTEP) 2021-2027. R. L. C. acknowledges his Predoctoral Contract under the framework of the project PID2021-126148NA-I00 funded by MCIN/AEI/10.13039/501100011033/FEDER, UE. A. Santiago-Alonso thanks funding to the Doutoramento Industrial program from GAIN-Xunta de Galicia. M. O. L. thanks the Xunta de Galicia for his ``Axudas de apoio á etapa predoutoral" grant (ED481A 2022/236). J. J. Parajó (ED481D 2023/014) thanks the I2C postdoctoral program of the Xunta de Galicia for their support in funding the study.  H. M. C. thanks the USC for his ``Convocatoria de Recualificación do Sistema Universitario Español-Margarita Salas” postdoctoral grant under the ``Plan de Recuperación Transformación” program funded by the Spanish Ministry of Universities with European Union's NextGenerationEU funds. This publication and the contract of T. M. M. are part of the grant RYC2022-036679-I, funded by MCIN/AEI/10.13039/501100011033 and FSE+. Authors acknowledge M. Martín (RIAIDT-USC) for the technical support in NMR measurements.