Hi there For Kenya you can pick up a Safaricom SIM for 100 shillings (less than £1) and PAYG top up vouchers readily - this can be done at Nairobi airport and some hotels have handy shops that can also do this. Veggie food should be fine - though a lot of pizza/pasta type choices for veggies. Safety point, don't walk in Nairobi after dark, take taxis. Enjoy! P.