Shiva Purana

siva.sh/siva-purana/saturda-samhita/15/33

शीर्णपर्णाशनैर्धीरः षण्मासं सम्बभूव सः ।। षण्मासं वायुभक्षोऽभूत्षण्मासं जल बिन्दुभुक् ।। ३३ ।।

sanskrit

The courageous devotee spent six months by eating withered leaves. The remaining six months he spent drinking drops of water or simply breathing.

english translation

zIrNaparNAzanairdhIraH SaNmAsaM sambabhUva saH || SaNmAsaM vAyubhakSo'bhUtSaNmAsaM jala bindubhuk || 33 ||

hk transliteration by Sanscript