I would genuinely say try not to stress about money understand what you can reasonably afford a few weeks before and build from there.
Add some beers or juice and dry nibbles on the weekly shop occasionally so you have stuff to take if you cant afford to buy it there.
There are already separate threads for these topics so I am locking this thread.
https://www.efestivals.co.uk/forums/topic/255080-ticket-competitions-2025/#comment-6801024
https://www.efestivals.co.uk/forums/topic/255181-volunteering-2025/page/4/#comment-6852089