I will be in Holland and am looking for records regarding my family in France, Holland, Germany, and England. They were Huguenots and fleed France.

Ms. Smith, there will surely be many findings to be discovered with these surnames (for example: Dupuy in The Netherlands, ca. 1692-1760, mainly in Amsterdam and Rotterdam) — but the countries you mention are very big, and there might be so many findings, that the search would “drown” ; meaning: many results don’t mean anything for your research anymore, and people’s help here would be useless (or wasted time). 

So: could you, perhaps, be a little more *specific* as to the “clues” you are starting this research with? Do you have anything precise or substantial, like *given names*, places of *residence*, occupations, etc. ? 
Have a nice evening!

According to Mrs Smith' bio
Will be traveling to Holland and looking for a family who traveled to Holland when Huguenots were expelled from France in about 1685. Records regarding Bartholomew Dupuy and his wife Suzanna Lavillon may have lived in Holland before transfer to Germany, England then the United States.

Neither Bartholomeus, nor Susanne, appear in the main databases of the Netherlands.

You could try the fiches of the Eglise Wallone, https://genver.nl/nl/dtb5055.htm
to be completely sure (I did not). Don't click on "snel zoeken", just click on the film number in the left row.

Voor de forumleden, zie https://www.wikitree.com/wiki/Dupuy-25#Biography

De beste man is hier nooit geweest, althans in ieder geval niet lang genoeg om in de archieven terecht te komen.

They continued on into Germany and relative safety. Next, they traveled to England, 
where they stayed until 1700, finally coming to America and settling in Virginia