Many hotels, even the more expensive ones, don't have a bathroom catering for disabled people (roll-in shower etc). So if you don't want to be severely restricted in your travel plans, you must improvise!

Toilet. For trips away, I've adapted my manual wheelchair so it can be used as a toilet/commode chair. It is possible exchange your normal cushion with a pressure relieving padded toilet cushion. Don't forget to make skin care your priority here!

Washing. Be prepared for regular bedbaths. You'll be lucky to find roll in showers outside the 'developed' world, and often a hose-down in the sunshine or a bucket of lukewarm water over your head is the best you'll get. Try to do this in private to avoid crowds of amused children. I throw a bin liner over my chair backrest for these showers, and dry it thoroughly or let it dry in the sun afterwards.

This is advice only. You are responsible for care of your body - don't take unnecessary risks!