With a hand operated spray gun made by Homax. It is a hand pump gun that looks like an old time bug sprayer. You mount a 1 gallon container of texture mix on the top of it and spray with old fashion arm power. I have done an 8 foot by 20 foot wall with mine non-stop. It is perfect for remodel jobs and repairs.
I bought mine at Menards here in the midwest, but I'm sure they are available everywhere. It cost me approx $34
Their web site is at: