Desperta Ferro! is an energy drink produced in Catalonia by XECNA. It is sold in 250ml aluminium cans. These are made to be drunk at room temperature so can be stored anywhere easily, and can be bought in packs of four.
Variations include Desperta Ferro Multifruit Juice; Desperta Ferro Cola and Guarana which is Desperta Ferro with a mix of Cola and Guarana; and a green tea and lemon version.
References
Desperta Ferro! (drink) Wikipedia(Text) CC BY-SA