[Machine] Concerning fasting on Saturday, except in obligatory situations, it is said, "If none of you can find anything but the bark of a tree, then let him break his fast with it."
عَنْ صِيَامِ يَوْمِ السَّبْتِ إِلَّا فِي فَرِيضَةٍ وَقَالَ إِنْ لَمْ يَجِدْ أَحَدُكُمْ إِلَّا لِحَاءَ شَجَرَةٍ فَلْيُفْطِرْ عَلَيْهِ