Order 1: life jackets usually life jackets are orange or orange-red, such life jackets itself has the effect of repelling sharks, so it is not recommended to occupy the weaving of the shark repellent medicine
Order 2: water containers, even more important than desalination chemicals, in the sea should never drink directly from the sea, because the ratio of salt excretion in urine is fixed, drinking sea water needs to excrete more water to excrete salt. Even more important than desalination chemicals, you can never drink seawater directly in the sea, because the ratio of salt excretion in urination is fixed. If you drink seawater, you need to excrete more water to excrete salt, and if possible, it is more realistic to drink rainwater and your own urine. >Sequence 4: Energy bars or first-aid compressed cookies This is mainly to provide heat, as immersion in seawater is a slow process of heat loss, and people can easily die of hypothermia, so eating is essential
Order 5: First-aid kit Mainly consumables for treating injuries, and commonly used medications. On the other hand, the faint smell of blood can attract unwanted visitors. Another crucial thing is that a lifebox or a life pack can provide you with a space to hold a lot of other equipment or collected survival supplies, which is very useful in the wild
The above are the basic needs to save your life, and they are the essentials. You can live without the other things, but without them, your chances of surviving at sea are greatly reduced. The Navy has a flashing beacon that floats on the surface of the water as long as it is immersed in the water, and even if you fall asleep or are unconscious in a shipwreck, it will automatically flash, and this is very necessary. Smoke can be used during the day to emit colored smoke, and at night to emit a bright flame. I've used one of these, so be careful. The used units are usually very hot. This is mainly used when you're spotting ships and searching for planes, and it's much more practical than a flare gun, so I won't go into details about the flare gun.
Order 8: Survival Knife I was going to put communication equipment in this order to fit into the categories, but communication equipment, especially effective communication equipment, is extremely difficult to obtain in a distress situation. If every lifeboat had a marine satellite phone, it would be unbeatable, so here's a list of active survival tools. Lifeguard knives can be used both to help keep danger down in the field and as a tool to help you replenish your supplies and deal with prey, and are very versatile, so it's worth mentioning that a good lifeguard usually comes with attachments, such as a flint, a fishhook, and a water purification agent, which is extremely useful in the field.
Order 9: life rafts Honestly, it's a luxury, but if you have a life raft, your chances of surviving without being submerged in seawater are greatly increased, and you don't have to face the immediate dangers of dehydration and hypothermia
Order 11: communications equipment It's a luxury, but it's a luxury, and who wouldn't be stranded at sea if they had a marine satellite phone, but it's true that you should have a means of contacting the outside world if you have the means, but that's not realistic. But if you have the means, you should be able to communicate with the outside world, but it's not practical
Order 12: Positioning devices: Watches, compasses, GPS, all of these can be effective locating devices, but the problem is, in a shipwreck situation, it's also a luxury to have access to them, even if you can get your own position data, it's not necessarily going to be helpful, and experienced people don't really need them
Order 13: Insulated wetsuits: this is a very important thing in terms of saving lives. But because of the practicality of obtaining it, it's at the back of the list
Order 14: Fire, usually flint, but also waterproof matches in watertight containers, but the problem is that experience or a good life-saving knife is all that's needed, and flint is usually used in conjunction with a knife, so the need for separate fire is not great, but it's useful, and people usually buy the kind of flint that you wear around your neck and that can save your life if you need it.
Order 15: Lighting equipment Lighting is also very important and can be used as a signal for survival, but if you have the equipment in the first order, this equipment can only bring you convenience, but will not greatly improve your chances of rescue
Overall, the 15 items are very broad, and if you prepare according to this criterion, you have a very good chance of surviving, and the other thing is, you should never try to survive. You're right, don't try to find the island, wasting your energy will only make you die faster, if you want to know what to expect, you can check out the Discovery Channel's "Secrets of Wilderness Survival", where people have survived on their bare asses.