You'll need a passport, enhanced driver's license or NEXUS Card.
From Canada Border Services Agency website:
http://www.cbsa-asfc.gc.ca/publicati...f5082-eng.html
Alcoholic beverages
Alcoholic beverages are products that exceed 0.5% alcohol by volume. If you meet the minimum age requirements of the province or territory where you enter Canada, you can include limited quantities of alcoholic beverages in your personal entitlement. Minimum ages for the importation of alcoholic beverages, as prescribed by provincial or territorial authorities, are as follows: 18 years for Alberta, Manitoba and Quebec; and 19 years for the remaining provinces and territories.
You are allowed to import only one of the following amounts of alcoholic beverages free of duty and taxes:
1.5 litres (53 imperial ounces) of wine; or
a total of 1.14 litres (40 ounces) of alcoholic beverages; or
up to 8.5 litres of beer or ale.
Note:
The CBSA classifies "cooler" products according to the alcoholic beverage they contain. For example, beer coolers are considered to be beer and wine coolers are considered to be wine. Beverages not exceeding 0.5% alcohol by volume are not considered to be alcoholic beverages.
The quantities of alcohol you can bring in must be within the limit set by the province or territory where you enter Canada. If the value of the goods is more than the free allowance, you will have to pay duty and taxes, as well as provincial/territorial assessment on the excess amount. In Nunavut and the Northwest Territories, you cannot bring more than the free allowance. For more information, check with the appropriate provincial or territorial liquor control authority before your arrival to Canada.
http://gocanada.about.com/gi/o.htm?z...el/faqs-e.html