Depending on the area it'd be difficult to get without driving as well. I know around where I live you have to go to multiple different doctors in different areas to get any add medication, and they are not guarunteed to be close to each other or near mass transit
General physicians can refill ADD meds. You mainly need to see a psych to get the script started. You guys are making this out to be some kind of incredible task with an uphill battle. Most health insurance offer free transport to doctors appointments (check your brochure.) Medicaid and medicare always do. Otherwise, public transport or rideshare isnt gonna break your bank for 1 or two visits until your regular doctor will write the refills. Or the psych can give you 2 or 3 months worth of scripts which is often the case.
It is difficult to get a doctor to prescribe you those drugs when you have a history of using meth.