If you are travelling by bus then you will be able to get hold of timetables and fares information from the local bus operator. 

Bus operators in Berkshire:

Arriva covers Reading, Sonning, Twyford, Wargrave, Henley, Marlow, High Wycombe

Courtney Coaches covers Wokingham, Winnersh, Earley, Reading

First Group covers Berkshire and Thames Valley

Fleet Buzz covers Riseley, Swallowfield, Spencers Wood, Reading

Newbury Buses for services in and around Newbury

Reading Buses for services in and around Reading

Thames Travel covers South Oxfordshire and West Berkshire

Bus Services (Royal Borough of Windsor and Maidenhead)