Pack neutral, modest, layerable clothing for warm afternoons and cool mornings, closed-toe shoes you can work in, a hat and sun protection, any medications in original packaging, your passport with at least six months validity, and about $500 in cash. Skip camouflage clothing, expensive jewelry, and drones.
Neutral colors for safari days, modest clothing (covered shoulders and knees) for village, church, and school visits, and work clothes you do not mind getting dirty on Garden Tower build days. Mornings are cool; afternoons are warm. Laundry is available, so repeating outfits is normal.
Closed-toe shoes for project days, comfortable walking shoes, sandals for the evening, a refillable water bottle, a headlamp or flashlight, a power adapter, and a daypack for the jeep.
Passport valid six or more months past your return with a blank page, printed Kenya eTA approval, travel insurance details, and roughly $500 cash in newer bills (2013 series or later).