Is it going to be used very often or is there an option to rig up a solar panel and leisure battery instead? Basic caravan spec stuff is probably as cheap as a generator now. I use a ghillie kettle, it burns twigs and dry cuttings to boil the water and the ash it creates is great for the garden.
If you can keep your head, while those around you are losing theirs, you may not have grasped the seriousness of the situation.
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"You don't stop gardening because you get old, you get old because you stop gardening." - The Hampshire Hog