We would recommend using denatured alcohol as it burns most cleanly (minimal smoke and cleanup). The stove should be used in a well ventilated area.
The product is as the picture shows.
You can as long as it is very pure and 50 or more proof isopropyl. Isopropyl has impurities so it will leave a lot of soot on everything. HEET from the car store or convenience store. Let us know if you have any questions.
Yes you can buy a kettle that fits the Trangia 27-5 UL Stove. It's 27 Series Kettle, you can find it on our site here: http://www.campsaver.com/kettle-6l-27-series