How to get more shield?

There are many ways to get more shield. The Mini Shield potions are good to use first as these cannot be used once you have a shield greater than 50%. You can use the large shield slurps to add additional 50% of shield at any point. Also there are some locations where you can add more shield. For example if you find the Slurp Truck and stay close to it while you or someone from your team destroys it you'll be up to full shield when it explodes. Certain points in Slurpy Swamp will also restore your shield by you simply just standing in the water.

Slurp