On our latest trip out to Tenerife, we booked with one of the low cost flight operators - RyanAir to be exact.
Whilst the cost of the flights were not expensive (they were in fact very cheap - around £100 return), I was shocked to discover the cost of any extras on the flight. . .

My wife and I ordered from the in flight bar service a bottle of water and a Gin & Tonic, the price of this was £10.30.
The Gin and Tonic was £7.30 and the water, a small bottle cost £3.00, I thought this was very expensive and said so.
I was informed that the gin was actually on offer as a buy one get one free, or 50ml for the price of 25ml - pardon me but on all other flights I have taken both with RyanAir and other carriers, an in-flight Gin and Tonic always consisted of a 50ml bottle of Gordons Gin and not 2 x 25ml of 'non-branded' cheap Gin.
Whilst I accept that inorder to subsidise the air fares companies who offer Low cost flights to Tenerife have to make a profit in other ways but surely £3.00 for a water (which costs less than 50p in any supermarket) and over £7.00 for a Gin and Tonic is excessive in anyones book.