HELP!!

My family is going to the lake this Saturday and eve says my period is starting Saturday and mine is really heavy ( have to change my pad every 2 hours) and all I wear is pads I'm to scared of tss but we're going to be out all day and there's no bathrooms!! What do I do?!? (I will have no wear to change and I almost leak at 2 hours so I can't keep it on all day) Have you guys ever been in the same type of situation please help!!