Make all the juices you will need for one whole day all at once, put them in jars and take them with you. You can put your daily amount in the fridge and any extras in the freezer to defrost over night.
Fresh juices are best, but this is about doing what works for you personally.
Disclaimer: The Gabriel Method is not intended to treat, cure, or prevent any disease or illness. This information is intended for educational purposes only, not as medical advice. Always check with your doctor before changing your diet, eating, or health program.