Battery draining

[skyl3rm]

What's the best way to track why my battery is draining? I drove It fine last week. Went out of town Friday. Came back Sunday and wouldn't start. Jumps off fine. Auto zone said both battery and alternator are good but something is apparently draining it.
One thing I noticed now too is after I jump it off and use my keyfob to lock it the horn won't honk. Not sure if there's any correlation there. Any ideas?

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[ccapehartusarmyINF.(ret)]

my horn doesnt honk unless i click lock twice in rapid succession

if you know how to use a mutimeter disconnect the ground to the battery and set your mutimeter up to read amperage and attach it between the negative post and the negative battery terminal and if it reads between 25-50 milliamps or more with the vehicle off something is sucking to much juice start at the fuse box and check the relays first then start checking everything stereos etc