I don’t waste my time boiling/simmering food, it also uses loads of fuel too. I rehydrate my food in a ‘Pour and Store’ bag, placed inside a DIY pot cosy (made from foil-backed bubble wrap). Couscous is ideal, pour hot water on, place in pot cosy and wait a minute or two. I then put a pouch of ‘Tuna with a Twist’ on top. If you’re only using hot water to re-heat things you haven’t much washing up to do either.
MYOG pouch in background.
Some links with a lot of answers to your questions:
My Bike and Kit Setup[/url]
Bike and Bivi
Bear Bones Bikepacking
MTBR Bikepacking[/url]