To complete one of the Thirst for Slurp Week 3 Challenges, you will need to upgrade a weapon with a Weapon Upgrade Node! You will need to upgrade 3 of them, or at least make 3 upgrades. for this, you will therefore need a lot of resources, but also know the location of the different improvement stations.
For this challenge, you will need to go to a weapon upgrade station in order to increase the power of your firearms. There are 22 of them, you can find them everywhere on the map, but be careful because it's not free! Each upgrade will require resources from you, and the higher the rarity, the more resources will be required. First of all, you will have to collect one or more weapons, and go and collect materials.
As a reminder, it's easier to complete this challenge in Team Rumble, then with respawning, you won't have to worry about dying.