Making your espresso on the go is much easier when you have a reliable, portable espresso machine. Take the Nuttii x Timemore E-coffee for instance: it lets you use coffee grounds or Nespresso pods to prepare your drinks. This machine has up to 20 bars of pressure to get the job done. You will be able to use this with cold or hot water. This model has an OLED screen to show temperature and progress.
E-coffee can reach a brewing temperature of 92C in just 2.5 minutes. With hot water, you can make fresh coffee in 20 seconds. This portable espresso machine has a 7500mAh battery, which is enough to brew 5 espressos if you use the heating function. If you bring your own hot water, you can make 100 cups of coffee. This project is currently active on Kickstarter.