Answer
(Fatwa: 295/257=D/1430)
If it is useless, it is better to pour it in plants etc, it is unlawful to put it in an impure place.
(2) It is allowable to eat at table sitting in chair if needed so. But using knife and fork is the way of others, so one should avoid using in unnecessarily just for the sake of show and display.
(3) In any way, he should let his hands to touch the soil up to elbow and pass his face on wall, this will suffice him. He is not allowed to miss the salah, but he will not have to repeat it:
إذا کان یداہ کلتاھما قد شلتا ولا یستطیع الوضوء والتیمو قال یمسح یدہ علی الأرض یعني ذراعیہ مع المرفقین و یمسح وجھہ علی الحائط و یجزي ذلک عنہ ولا یدع الصلاۃ علی کل حال (المحیط البرھانی، کتاب المسائل 138)
If he is unable to do it as well, then according to Imam Abu Yusuf he can adopt the resemblance of salah, and later he should repeat the salah with tayammum when he is able to do so:
قال في الطحطاوي: من لا یقدر علی الوضوء ولا علی التیمم لا بنفسہ ولا بغیرہ ۔۔۔ وقال أبو یوسف: یصلي تشبھا و یعید (حاشیۃ طحطاوی علی المراقی)
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband