In Australia we had neither toilet, or shower, but life is different there and here ! Ocean-side it was easy to go swimming every day and use the showers that punctuate the coast, Some are small buildings where nobody looks you oddly if you use SOAP and shampoo !
In France we have preferred to have a shower, although for now the car is used exclusively for bathroom cupboard and WC. So far we have taken our public homestay or the bathroom showers (where the evocation of the hygiene in the budget, which is far overpriced !) It is of course possible to take three showers in the day, It will take just to fill the tank with clean water (60 liters TNT) more often !