for outdoor living, have you stayed there already all year round?
i would not advise containers for living space, unless they are in good shade as they get hot
any land you want to buy i would suggest you buy all at once
as any ajoining land will suddenly increase in value once you have bought your plot
even if there are no other buyers
as for 1 rai being too little or too much
extra space allows you to plant more very low maintenance trees, that may take a few years but will be worth it
i don't plan on growing for profit, but will see what i can do once i have the excess produce in ways of preserving and it could always go to animals or compost
make sure you plan a space for composting and worms etc.
just to add we feed our chickens from stuff in our garden, so do plan to grow for them too
there is no need to buy chicken feed
do you plan to have a small pond for water and fish ?