You could also buy a beaker with a lid and make your shake up in that - I do that whenever I am due to be out and about. Really not worth taking yorself out of ketosis by having 2 bars a day, that would defeat the object of a VLCD!
For the first couple of weeks dont do any strenuous exercise at all, after that you could start going to the gym but you need to be careful not to overdo it.