I can't remember now where we first saw it mentioned but Eleanor and I thought the RNLI's H2Only campaign at the beginning of the month was a great idea.
H2Only was a ten day challenge set by the RNLI to drink only water, to raise money for this deserving charity. I didn't take up the challenge but Eleanor did. She did really well and drank nothing but water for the whole ten days, there was no cheating at all. I was quite surprised that she managed it really as she does like her fizzy, sugary drinks. It saved me some money not having to buy Eleanor's favourite drinks when I did my shopping so I donated what I'd saved to the RNLI.
The Royal National Lifeboat Institution provide a 24 hour lifeboat search and rescue service around the UK and Ireland as well as a seasonal lifeguard service. It's funded by charitable donations and has saved over 140000 lives since it was founded in 1824. A very worthy cause.