A properly sized and installed transformer will work, I suggested that in one of my first posts. However, it will also cost a good bit, and I'd put my money into a generator before I'd go with a transformer.
3000 Watt Maximum Capacity, heavy-duty continuous use transformer Converts 110/120 V to 220/240 V OR converts single phase 220/240 V to 110/120 V (switch is on back of unit) Compatible with 50Hz/60Hz. On/Off switch with indicator lamp 4 outlets on front of unit (outlets accept 3 or 2 prong US plugs and 2 prong Euro/Asian plugs One Universal outlet can accept 2or 3 pin plugs from UK,Australia,New Zealand,Asia or Europe. Insulated power cord is hard wired with a grounded European Shucko plug also good for Asian outlets Comes with 2 prong US adapter to enable non-grounded use in the USA, Canada and Mexico Grounded 3 prong US adapter also available - See Item No. VP 13 under Plug Adapters (grounded 3 prong US adapter also available - Item No. VP 13) Easy to carry with attached handle, heavy-duty metal casing Fuse Protected