You might want to watch a variety of movies (all drunks do not sound alike).
Two which may help (both have tipsy people as characters) are 'Barefoot in the Park' with Robert Redford and Jane Fonda and 'Cat Ballou' with Jane Fonda and Lee Marvin.
Some episodes of the old 'Dick Van Dyke Show' also have characters who are supposedly drunk, so you might see if you can scare those up as well.