This is not the first 48 hour strike we will be having, there is another planned for the same time next week so you may as well get some back up plans down now.
Here is a link to a great tube map made by Ian Visits that shows the stations still in working order over this period. It's not al doom and gloom but it's worth remembering that the stations open will be very busy and trains will run far more sporadically than usual.
Then there's always the buses but of course, especially in rush hour you are likely to have to let at least 3 go past you due to them being too full.
Below is a whole list of stations effected as reported by TFL. Really your best bet is to walk, cycle (carefully as there will be a lot of traffic about) or simply stay at home.
Trains between Queen’s Park and Elephant & Castle every six minutes, although these trains will not stop at Edgware Road, Embankment, Kilburn Park, Lambeth North, Maida Vale, Piccadilly Circus or Regent’s Park
No service through the central area, but trains will run between Epping and Leystone around every 12 minutes, and between West Ruislip and White City every 15 minutes
No service expected at all; use the District, Hammersmith & City and Metropolitan lines instead
Trains will run between Upminster and Wimbledon every eight minutes, and between Ealing Broadway and High Street Kensington every 20 minutes, but these trains will not stop at Aldgate East, Becontree, Blackfriars, Bromley-by-Bow, Dagenham East, Dagenham Heathway, East Ham, Elm Park, Gloucester Road, Hornchurch, Plaistow, Sloane Square, Stepney Green, Temple, Upminster Bridge, Upney or Upton Park
Hammersmith & City line
Trains will run between Hammersmith and Moorgate every ten minutes, not stopping at Barbican, Euston Square and Great Portland Street
Trains should run between Stanmore and Finchley road every five minutes, and between Waterloo and Stratford every five minutes, not stopping at Bermondsey or Southwark
Transport for London intends to run trains between Harrow-on-the-Hill and Aldgate around every ten minutes, but these services will not call at Barbican, Euston Square, Great Portland Street, Northwick Park and Preston Road
Trains should run over the whole line apart from Mill Hill East, but services on both the Bank and Charing Cross branches will not stop at Borough, Chalk Farm, Clapham North, Clapham South, Colliers Wood, Embankment, Goodge Street, Hampstead, Highgate, Leicester Square, Mornington Crescent, Old Street, Oval, South Wimbledon, Tooting Bec, Tufnell Park or Warren Street
No service is expected in the central area, but trains will run between Acton Town and Heathrow Terminals 1, 2 and 3 every ten minutes, and between Arnos Grove and Cockfosters every ten minutes. These trains will not stop at Heathrow Terminal 4 or Southgate
Trains should run between Seven Sisters and Victoria every five minutes, not stopping at Warren Street
Waterloo & City line
Around 100 extra buses on the key routes of the 700 in total
Emirates Air Line
TfL promises ‘enhanced’ services will be in place