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This link leads to several articles discussing fruit drop of citrus: http://www.google.com/cse?cx=012078378210706707791%3Af1h5n_k1r5e&ie=UTF-8&q=lemon+fruit+drop&sa=Search#gsc.tab=0&gsc.q=lemon%20fruit%20drop&gsc.page=1

Hopefully, this article will help: https://www.gardeningknowhow.com/edible/fruits/oranges/growing-an-orange-tree.htm

Blossom drop is not unusual for any citrus or other fruit tree. That is discussed in this article: https://www.gardeningknowhow.com/edible/fruits/citrus/citrus-blooming-season.htm

You state the tree has been well watered. Is it in a container? Is the water running right through the soil...really fast? If so, it's very likely that at some point the soilball has become too dry. To rehydrate, simply soak the entire soilball in a large bucket or tub overnight.

This can indicate either poor pollination or poor water supply or nutrient supply. If the fruit is not pollinated, the tree will drop them. And if the tree does not have enough water or nutrients to support the fruit, the tree will also drop them.

This article will have more information:
https://www.gardeningknowhow.com/edible/fruits/oranges/no-fruit-on-orange-trees.htm

Many things can cause this, but it's usually a watering issue. This article should help: https://www.gardeningknowhow.com/edible/fruits/citrus/leaves-falling-off-citrus-tree.htm

Dry can be caused by a lack of water, over mature fruit, immature trees producing fruit, nutrient deficiencies or stress – due largely in part to improper fertilizing or planting and extreme changes in temperature. Judging from your description, the fruit may either have been stressed by the weather or may have been over ripe when picked. Here is more info: https://www.gardeningknowhow.com/edible/fruits/oranges/dry-orange-fruit-why-an-orange-tree-produces-dry-oranges.htm