1. Perform the complete wudhu. If you are bathing in a place where the water collects on the ground and there is no water outlet, then postpone the washing of your feet to the end of the ghusl. After completing the other acts of the ghusl, you should move to another place and wash your feet.
عن عائشة قالت كان رسول الله صلى الله عليه وسلم إذا أراد أن يغتسل من الجنابة بدأ فغسل يديه قبل أن يدخلهما الإناء ثم غسل فرجه ويتوضأ وضوءه للصلاة (سنن الترمذي، الرقم: 104)
Hazrat Aaishah (radhiyallahu anha) reports that when Hazrat Rasulullah (sallallahu alaihi wasallam) would intend to perform fardh ghusl, he would commence by washing his mubaarak hands before submerging them in the utensil of water. Then, he would wash his private parts and perform wudhu, just as he would perform wudhu for salaah.”
عن ابن عباس قال قالت ميمونة وضعت لرسول الله صلى الله عليه وسلم ماء يغتسل به … ثم تنحى من مقامه فغسل قدميه (صحيح البخاري، الرقم: 265)
Hazrat Ibnu Abbaas (radhiyallahu anhuma) reports that Hazrat Maimoonah (radhiyallahu anha) said, “I placed water for Hazrat Rasulullah (sallallahu alaihi wasallam) to perform ghusl … (After completing the ghusl,) Hazrat Rasulullah (sallallahu alaihi wasallam) moved away from the place where he had performed ghusl and then washed his mubaarak feet.”