No access to organic produce

My mom was diagnosed with colon cancer last Wed. 

We are researching options, she already discarded the surgery/radiation combo.

One of the challenges we have is that the is no access to organic produce in Venezuela where she lives, all is full of fertilizers and pestizides.

 Any suggestions?  I am told that putting the veggies under the sun can purify somewhat?

 Thank you in advance for any tips

Just wanted to report that I consulted a naturopatic doctor and she advise to grate, dry overnight and  then grind radish, to be stored as a powder in the gridge.

This powder can then be used to soak veggies and removing toxins such as pesticides from them