Corn sugar=dextrose. Which is the priming sugar most LHBS sells.
The best way, is to add it to the container instead of into each bottle. Weigh out how much you need. Fill pot with water, enough to cover the sugar, and boil while stirring for a few min. Cool to the temp of the fermenter then add and stir gently. You don't want to introduce oxygen. This will give you even amount of sugar for each bottle. Use this site http://www.tastybrew.com/calculators/priming.html
to determine how much sugar per gal to add.