Posted: 30/03/2016 at 07:00
Hi Jay What an adventure you're having. As you're discovering, lots of fruit and veg don't keep long in the heat, but we'll try to help
Pineapple - I think you're doing the best thing with it - slice and core and keep it in it's own juice in a covered plastic box or dish in the fridge.
Bananas go brown in the fridge - just keep them somewhere cool and don't wrap them. You can freeze bananas if you're going to make smoothies or milkshakes with them or bake them in a cake. When you use them don't thaw them, peel and chop and put in the blender.
Peppers and tomatoes you seem to be doing fine with. Or they could go in the salad drawer of a fridge. But whole, not sliced.
Green beans will keep whole in the salad drawer of your fridge. If they're turning purple they're just ripening - some varieties do that - nothing to worry about.
Carrots - can you get any sand - you can keep them in a cool place in a box of dry sand. Otherwise just put them in a cool dark place. If they have dark spots just cut these out when you prepare them.
Lettuce doesn't keep long once harvested but the best thing to do is cut across the base of the stem and put it in a bowl with a little water in the bottom and keep it in the fridge. Don't have your fridge turned down too cold ... 4C is fine.
Potatoes - just keep them in a thick cloth sack or box in a cool DARK place. As you have discovered if they are in even a small amount of light they photosynthesise and produce chlorophyll and turn green. Green potatoes are poisonous - do not eat them. Prepare them as you need them. Do not keep in water.
The best thing you can do is to leave your fruit and veg whole and prepare it only when you're going to use it - and in warm climates shop at least twice a week, or daily if you can.
Hope that helps.