You can do it by western union... Here: https://www.westernunion.com/us/en/send-inmate/start.html. Just pick the correct facility (If you don't know the correct facility, use this site InCheck to find out) and right amount. I hope I have helped
How Do I Send Money To A Bexar County Jail Inmate?
With most institutions you have to get a money order & put their name, doc# & send it directly to the prison to put on their books so they can buy what they need. You cannot send any money directly to any inmate. Put trust fund on bottom of money order so they know what it is to go to & who.