I would like to answer your question but i believe the costs of living in kenya vary a lot.
where will you be residing? if within the city then it will obviously be more expensive as opposed to living in an appartment where you have a choice to eat out or buy and make food at home.
Taxi rides vary as well , i would advice that you stick to one or two taxi drivers whom you can reach when in need .
we can organise this for you if you give us the chance.
living in a hostel or even a hotel will vary from the amount of money you would like to spend in a day.
please let us know and we can help you out, also check our site.www.winnerchoiceltd.com