This chapter details the key linkages between food security and nutrition (FSN) and water and unpacks the issues of access to water for FSN for women, men and children living in poverty and marginalized groups in particular. The allocation of water and the authorization to use water, as well as the infrastructure to get water to where it is needed, and at the quality needed, varies dramatically across the globe, and this allocation may either support FSN or hamper it. The issue of access to water for FSN is particularly important for people living in poverty, and marginalized groups. Access is profoundly shaped by socio-cultural, economic and political factors. Availability of food refers to the physical existence of enough food to support the FSN needs of all people. This food can be derived from domestic production and stocks, food imports, or food aid. Growing food at the household or community level is a critical element of ensuring access to FSN.