The first and most important step is to be aware of your surroundings. The UK's Anti-Hobo Squads are everywhere now. Do not be led astray by pleasurable tricks. Look at these two for example.
Do you think either of them have survived the purges? No! These men were day one victims of the homeless purge.

One of the easiest ways to avoid being cut in half is to buy a house, therefore no longer being homeless. However, you often will not have the money to merely BUY a house, especially in this economy (real talk your generation is screwed).
As an alternative, you can always MAKE a house.

As you can see here, this enterprising person has constructed a hood-yurt. This may not save him from the many gangs or random crackheads, but it may just be enough to ward away the Anti-Homeless Squads for some time.

But it doesn't need to be that fancy. This man has constructed a house out of an old box. He may yet survive, though his counterpart who cannot fit inside his house-box may not.

If you cannot make a house (and indeed, even this may not help you), then you must run. You can easily obtain nutrient syrup moisture from your local grease food establishment. KFC is recommended because, as you can see above, you can put the chicken into your pockets and fill the bucket with free liquids.

You may also use this chicken and some drugs we found in the dumpster behind the building to power a car. This will let you escape from the death squads cutting people in half, but beware that the more chicken you feed the car, the less you may eat.

You may obtain more food at McDonalds.

Perhaps now you may be asking yourself "but amazing and attractive article author, I haven't seen any of this, you must be taking the piss based on poor wording"
Well, shut your facehole, unwashed reader! If it wasn't real, what is this then?
Yeah, that's what I thought. But don't stop there! This is a REAL picture of a REAL homeless man being cut in half by Anti-Homeless Squads!

I am just so done dude, I can't take it anymore. You know they tell you it gets better after you graduate but that's just not true man.

Perhaps you don't want to do this anymore. Perhaps the homeless truly are a blight on society and being cut in half is the only way to make things better for the ones who are left over.

I mean, look at this, some guy was killed by a homeless dude probably. That could be you! You stabbing him I mean, not the victim. In that light, maybe you SHOULD be cut in half. Just putting it out there! Please, don't hurt me!

You see that? That is the almighty Shrek. Shrek can save you from being cut in half. You just need to pray "Shrek is love, Shrek is life"
He will enter from behind, and it may hurt, but if you please Lord Shrek then you too may not be cut in half.

If you follow these steps carefully, then perhaps you will survive in 2025. Good luck out there, and if you're unsure about anything, consult the Orbs for further help.