Lips
1. Pretend it's cold and make 'brrr' sounds.
2. Talk with an exaggerated lip movement.
3. Practice 'oo - ees' to get the full lip range.

Jaw
1. Do fish movements with your jaw.
2. Massage your face.
3. Massage your jaw line by pressing 'points' along the jaw line.
4. Yawn (not too widely).

Some not so silly looking exercises….
Practice talking in a 'posh' accent. And then practice talking in a 'cockney' accent.
Practice talking in a caring and breathy voice.
Try saying 'hello darling' in all three voices to start off with. You can do complete sentences once you are comfortable.

STEAM INHALATIONS
The ideal conditions for your voice is to stay wet and warm. So along with fluid (no caffeine and non-alcoholic) this is where steam inhalations can help. 
You can use either plain hot water (not boiling hot) or you can add menthol or eucalyptus oil. This depends entirely on your choice.