[meganm]

I'm not sure about what you can get in the UK, but I've heard that most, if not all seed mixes lack the amount of protein needed for a hamster, which is why it's recommended to mix it with pellets high in protein. You can also add in fresh veggies and animal protein (mealworms, dried bugs, plain chicken, etc) for more variety.

I personally use half Higgins Sunburst seed mix and half Mazuri Mouse & Rat pellets, but I don't believe those will be available for you.

I think the food mixes on Etsy look good and most of those don't have the "fillers" like hay pellets that hamsters typically dislike. You'd probably need to add pellets to those mixes.

Hamsters don't "need" water bottles like some people think, but some hamsters may like it more than a bowl, so you can offer one or both. Pros and cons: water bottles are harder to clean, but last longer; bowls are easy to clean, but need to be cleaned regularly.

Please take all of this with a grain of salt since I'm a new hamster owner!