I am writing this especially for those, having an Unfurnished Bathroom or those who stay in rented accommodation, where there is very limited scope of any modification. People who do not cabinets or a separate shower area face difficulties in storing bathroom essentials etc.
Despite all this, with little efforts, we can make our bathroom very organised and beautiful. I personally understand the multiple constraints which occurs while organizing and storing so many things in a small unfurnished Bathroom.
1. Sink Area

I don’t have a separate sink area. I just have a washbasin in my Bathroom. So, Its difficult to store toothbrushes, soaps etc at a small place. I have placed a Multipurpose Storage Holder Stand to hold toothbrushes, toothpaste, hairbrushes etc.

Alternatively, Old jars/Mesh Pen Holder can also be used.
Just to make the area around the sink look beautiful, I keep a decorative piece (artificial plant) on basin side.

Alternatively, One may use a Plastic Container on the Sink to keep your frequently used items. This will keep them all at one place.

If you have a sink area, use Ceramic Bathroom Accessory Set to keep liquid soap, Toothbrushes and Paste.
2. Bathroom Essentials

Since, I have no cabinets or shelves in my Bathroom. I use Multi shelf sliding rack to keep other Bathroom Supplies which is kept neatly below the wash basin as it utilizes the vertical space left under the wash basin. The complete Organizer can be easily slipped in and out because it has wheels. When needed, Just slide out and pick out your items.

Top Shelf is used to keep most frequently used items like Shampoo, Toilet Cleaner, Toothbrush holder, Face wash, Moisturizer etc. Middle shelf is used to keep extra hand towels and toilet rolls. Bottom shelf is used to keep extra cleaning supplies and soaps.
Wall Corner Shelves

Use these Wall Corner Shelves to store Bathroom essentials neatly and organized. Three wall shelves can store almost everything required in the Bathroom.
Shower Caddy

Alternatively, You may use a Shower Caddy which is simply hung on the Shower Head to store the Shower Supplies.
Over the door Organizer

Over the door multi use organizer is used for hanging left over bathroom essentials. It avoids unnecessary nailing or drilling of the door in installation. Similarly, In shower area, I use this organizer to keep Shower Supplies like Shampoos & Shower Gel.
Separate Basket

For extra Bathroom & Cleaning Supplies, One may use a Basket with lid and store it under the Sink. The alternative idea is to de-clutter your regular usage area and keep other supplies at a different place.
3. Waste Bin

Just below the Sink, I use a suitably placed Waste Bin which has foot press opening. Hand Towel is placed in the Ring Hanger next to the sink. For Bath Towel, I have a Shower rod behind the Shower area.
4. Floor Mat

Use a Floor Mat next to the Pot. It helps to keep the area around clean and dry.
5. Mugs, Bucket, Tool

Mugs, Bucket and Stool can be kept at one corner of the bathroom.
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