Boil water with sugar and lemon juice, in the meantime peel and cut the apples into cubes. Add them to the pot and cook for about 5/10 minutes, blend everything, let it cool and it's ready.
We have the 5ml steel campfire from Primus.
The intermediate step.
Here is my juice bottle ready to drink!
If you want to put them under vacuum in the bottle or glass jar remember to put them to boil to sterilize them and then put the content still hot inside and put it upside down and let it cool.