Fluoride is absorbed by plants. How much depends greatly on the type of soil. But whether it crosses the membrane into the fruit itself no one seems willing to swear to or fully deny. Linked a good article on the issue below.

If it is a big concern to you there are several ways to reduce the amounts of fluoride in your water prior to putting it on the garden.

The real issue is the watering every other day. Most would consider that inappropriate. Frequent shallow watering like that can cause all sorts of problems, primarily shallow rooting of the plants. Shallow rooted plants will likely absorb even more of the fluoride. Your plants would be much better serves by less frequent but longer, deeper watering.

Dave

Here is a link that might be useful: Fluorides in gardening