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Typically, you will want to plant these around 12 to 20 feet away from water pipes. They will, definitely, seek out water and enter pipes wherever possible.

This collection of articles will help you to grow Oleander to its potential:

https://www.gardeningknowhow.com/ornamental/shrubs/oleander

Sure! These articles will give you all of the information that you could need:

https://www.gardeningknowhow.com/ornamental/shrubs/oleander

Apparently this happens a lot. Here is more:

https://www.gardeningknowhow.com/ornamental/flowers/flower-color-change.htm

I would leave it as is, until it recovers! This article will help with the control of these pesky creatures:

https://www.gardeningknowhow.com/ornamental/shrubs/oleander/oleander-caterpillar-damage.htm

There is an abundant number of ways to develop flower buds that still do not open; see which one applies in this case: lack of water or insufficient water; too much water; too much nitrogen from lawn fertilizers (use high phosphorus fertilizers); too little direct sunlight (aim for much more than 6 hours); competition for nutrients from other plants/some trees/weeds/grass/etc.; pruning when the plant is developing flower buds; pest infestation (mealybugs, scale, aphids, etc.);

They are very drought tolerant once they are established. Water it deeply. Try every 3 days. They begin to drop their foliage if thirsty, leaving the tree with an open canopy. If planted in container culture, you may need to water more often. Remove the oleander from its container and position it so it sits at precisely the same height in the soil as it did in the container. The base of the main stem should be at soil level, not below.