hy·dro·mel 
(hīdrə-mĕl′)
(hīdrə-mĕl′)n.
A mixture of water and honey that becomes mead when fermented.
[Middle English ydromel, from Old French, from Latin hydromeli, from Greek hudromeli : hudro-, hydro- + meli, honey; see melit- in the Appendix of Indo-European roots.]