Powerade have a 'try me free' offer on at the moment
The promotion is available on special promotional packs of 500ml bottles - found in most supermarkets.
Yes, and they'll refund your postage as well. You can also do it if you don't have a printer:
"To receive your cheque refund of £1.23 (inc postage), simply complete the application form at http://www.poweradeforfree.com,
print and post it with your promotional Powerade bottle label to: Powerade Try Me Free, Dept. No. 5428, PO Box 99, Aylesbury, Buckinghamshire, HP19 8RR.
Alternatively if you do not have Internet access, send your bottle label plus a plain piece of paper stating (in block capital letters) your name, date of birth, address, county and postcode to the address detailed above."
Easy and gets you a Free bottle...