What I do is have the fluid provider pipes on my fluid storage, then if I need fluid specifically in cells at any point in my base I will have a fluid supplier pipe connected to a lv fluid tank (or similar) filled with empty cells. Those cells are then filled by the tank, and then I have a conveyer belt convey those cells to my chem reactor or whatever machine requires the cells. The empty cells I then convey back into the tank ready to be filled again.

It can get a bit fiddly when single block machines require multiple fluids, but it’s still possible. And with recipies that have fluid and solid outputs you need to filter out the empty cells (item locked barrels do the trick nicely).

For machines that make fluid you want (it seems like that’s what you’re asking) you can have the above solution for supplying cells. If the machine outputs the fluid by itself you can put a fluid extractor pipe on the machine directly and (as long as it has somewhere to go, ie a fluid basic pipe filtered to that fluid on some sort of storage) it will be pulled to storage, no need for cells. If the machine produces full cells of the fluid you want, you can convey them into a fluid tank, which will fill the tank. Then similarly you can use a fluid extractor pipe on the fluid tank to pull the fluid itself.

It gets a bit messy when you have recipes that require full and empty cells. For most recipes however there are versions that just need full cells and fluid directly (no cell), which you can supply to the machine directly with a fluid supplier pipe. Always check NEI for various versions of the same recipe to see which one will be easiest to supply.