Picture speaks

Mobile toilet.

Necessity is the mother of invention

This is a mobile toilet which can be used by the bed side of patients unable to move up to the lavatory.

A plastic stool with four legs can be used. Normally a hole will be there in the centre of the stool. Let this be made bigger by using hacksaw not damaging the stool, this can be done by a carpenter. A plastic container as shown in the pic can be used as sump to collect the feces. This can be used any where, any time and hassle free. 

This is a poor man's toilet and also useful to the physically challenged.