A spider that has a dark brown abdomen, with reddish brown legs, and a light beige bottom with dark brown club like claws could be a wolf spider. It could also be a tree spider.
The spider is called a Woodlouse Spider, named for its main prey. It is totally harmless to humans aside from their semi-painful bite due to their large fangs designed to pierce the exoskeleton of woodlouse. (See related links, below, for a photo and Wikipedia article.)
A beige pool bottom will not make the water look blue. This is because the beige will reflect off the water making it look brown.
It would make a light maroon, like a reddish orangish sort of colour
Wolf Spider (venom is not dangerous to humans) or Brown Recluse (very dangerous venom).
tarantula
The spider you describe with a beige body and bright red legs may be a red-legged shieldback spider (Cyclosa mulmeinensis). They are typically found in Asia and are known for their distinct coloration.
If you find a beige spider with black dots, you can simply observe it from a safe distance. Avoid touching or bothering it as some spiders can bite if they feel threatened. If the spider is indoors and causing concern, you can gently place a cup over it and carefully release it outside.
It is a type of black widow spider
Acorns are light brown or beige on the tops and the bottom is dark brown.
The underside of a lady bug is often a beige or brown color.
orb (night) spider
It would make a light maroon, like a reddish orangish sort of colour