Figure a two hour bus ride and a one hour taxi ride. If the hut at Tlamacas is open, it will probably not be necessary to make arrangements in advance to go down, as there is enough traffic to make it fairly easy to find a ride. Take the first class bus from the TAPO station to Puebla. Take the second class bus from Puebla to Tlachichuca. Senor Joaquin Conchola was our driver.
Traffic is scarce, so arrange in advance to be picked up.
A less expensive alternative may be to take a taxi from Tlachichuca to the village of San Miguel Zoapan or Miguel Hidalgo, and walk the last four or five miles to the hut. This hike could help with acclimatization. The hut is crude, but it keeps the wind out.