As in any tropical region, good hygiene is not only important but makes sense: wash hands often, do not bathe in still water, wash fruits and vegetables with clean water. Only drink bottled water to avoid the “tourista”.

If you end up getting it anyway, reduce the consumption of vegetables and fruits and intead eat rice.
Take the medicine you brought and hydrate yourself by drinking a lot of water or cola (Pepsi or Coke). This is not a joke, but for infants still using bottle, you will have to eliminate the bubbles by shaking the soft drink before serving.

Vaccines :
The yellow fever vaccine is not mandatory but strongly recommended. Always have all your vaccines up to date (Diptheria, Tetanus, Polio)

Hepatitis A and B vaccines and Cholera are not mandatory.

Because of its geographic position, the sun in Senegal is probably more aggressive than where you will be coming from. Bring sunscreen for your protection and in the event you get a sun burn it is recommended that you bring some Aloe or an equivalent soothing lotion.
Bring hats and sun glasses.