Improvements:
Even though a copper cup was much better to use then a glass beaker, the experiment still could be improved by using a bomb calorimeter instead of a copper cup. Bomb calorimeter would converse more heat. Picture (1)
Picture 1: showing a bomb calorimeter
More accurate equipment could be used in order to minimize the errors: 200 ml and 15 ml measuring pipettes with uncertainties of (± 0.1ml).
More accurate equipment (with 2 decimal places) for the temperature measurements could be used. Picture 2
Picture 2: showing better equipment (with 2 decimal places) for the temperature measurements
A tripod could be used for holding the copper cup, in order to escape the absorption of heat by the clay triangle and the clamp stand.
Alcohol with a higher % of ethanol could be used in order to simplify the experiment and make it easy to light up the alcohol drink.
Bibliography:
http://www.liker.info/archives/82
http://www.21food.com/products/tequila-sierra-reposado-gold-288829.html
http://dominicanewsonline.com/news/all-news/court/father-of-2-loses-job-over-red-label-whiskey/
http://www.yatego.com/getraenke-treitz/p,4b265058c26ba,4b2268bfd899d4_6,molinari-sambuca-extra-1-00l
https://en.wikipedia.org/wiki/Ethanol
http://www.elecs.co/product/omron-digital-thermometer-mc-342fl-ladies-oral-odt05-510.html