The easiest approach is to use LEaP, which supports different solvent models. Read the section entitled "Solvent models" in the AMBER User's Manual; this is section 2.9 on page 28 in the Amber8 User's Manual.
Examine the contents of directory $AMBERHOME/dat/leap/parm. In Amber8 one finds parameter files, prefixed with frcmod which abbreviates FoRCe MODification, for chcl3, meoh, nma, and urea.
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