By tapping on the "Refill stock" button you can refill all your resource stocks in the chosen base at the cost of some water canisters. This function is limited by a cooldown timer and can not be used perpetually.

The water canisters required for this action depends on the amount of resources. The more resources are gained, the higher the costs will be. The price for refilling 1 to 500 units of resources equals 25 water canisters, refilling 501 to 1000 units will cost 50 water canisters, and so on and so forth.