Aladdin Aveo Water Bottle Grey Future Insights £5.49 @ Amazon
Summers coming and you can save yourself a fortune by spending £5.49 on a reusable water bottle. I have one of these in green (currently £8.99 but still totally worth it) and I've had it for about 5 years now. It's brilliant and still going strong. If you buy one you're going to have to pay delivery, but if you buy two or other add-ons your delivery is free on orders over £10.
The Aveo Water Bottle has an Easydrink Spout which is great if you're using it while exercising, or if you have a child who wants a sip and you don't want a bottle full of back wash. It also has a 100% leak proof lid, again - perfect if you've got it in your handbag or nappy bag so you don't get a bag full of wet.
It also comes with a carry handle, which they say is great for sport, but I find it really useful for clipping on to a bag for easy access.
The bottle is BPA free which means it wont be leaching toxins into your water and it's just an all round brilliant bottle for saving you money in the summer months, keeping you hydrated.