Why did Davos take it upon himself to sail past the siege in storms end with his onions, potatoes and salted beef?

Why did he decide to bring them food? I know Davis has some pov chapters but I read those books years ago and most of it is lost in my head. Does he ever explain why he did it?

https://redd.it/1t9am46
@gameofthronesbackup

RIP to my mom's perfect little dungeon crawler.
https://redd.it/1t9cmf5
@gameofthronesbackup

The Hound - realist, pessimist or cynic?

https://redd.it/1t9fstj
@gameofthronesbackup

Happy Mothers Day everyone! ❤️

https://redd.it/1t9hp4g
@gameofthronesbackup

I Love Joffrey Barannister
https://redd.it/1t9gpi0
@gameofthronesbackup

Which actors could switch roles & BOTH still deliver EPIC character performances?
https://redd.it/1t9m4qt
@gameofthronesbackup

If all of the Dothraki were decimated in The Long Night, where did they reappear from at King’s Landing?

https://redd.it/1t9qt5y
@gameofthronesbackup