From what we know, all of you Parti Pants are staying in accommodation that has a kitchenette with a fridge, an electric hob, cutlery, cooking utensils and crockery. The local mini-markets will have all the basics that you will need for in-room catering. If you are not staying at Poppy's or Kiki's, please check with your accommodation provider if you are unsure.
For those staying at Poppy's or Kiki's, there will be a kettle, hair dryer and plug-in mosquito devices that use tablets. We do suggest bringing a couple of travel adapters or one attached to a UK extension lead.
We can only comment on Poppy's and Kiki's, but most accommodation that we know of has air-conditioning. Just so you know, most air-conditioning units are set to not work if you have windows and doors open.
Tap water is generally safe to drink, but most people find it has a strange minerally taste that is not to everyone's liking. It is certainly safe for bathing and cleaning teeth. Bottled water is very widely available and inexpensive.
Ah, yes! Greek plumbing. The standard phrase is, IF IT HASN'T COME OUT OF YOU, DO NOT PUT IT DOWN THE LOO. It's not a big deal. A small bin is provided in the bathroom for non-organic waste. Standard practice in Greece.