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Try experimenting with very small amounts and see how it goes. You might be able to get free samples in some stores. If it works you can gradually try a little more at a time and get an idea of your tolerance. There are also green powders that are made of fruits and vegetables and should be easy...
Consider some protein powder you can mix with water. Don't get a cheap brand, but whey or mixed protein in a flavor you like is very easy to digest and it will protect you from muscle loss.