The Water is wide

This delightfull folk melody from England is played on my single melody string 5 chord zither. In the 2nd verse, the variation consists in adding thirds (3 notes apart Eg. C-E, A-C...) which are played using the plectrum (held between the thumb and index) and the middle finger. You need a finger nail on your middle finger, which is OK with me as a use nails when playing classical guitar.