how do I create SegWit address?

[ShitTeam]

What is the easiest way to do it?

[vroom]

I know this site, but I can not say anything about trustability: https://segwitaddress.org/

[User365]

What is the easiest way to do it?

I would recommend you to wait, till the wallets have implemented a simple method (create segwitaddress by default) for this. I think f.e. Bitcoin Core 0.15.0 will have this feature.

[TryNinja]

I would rather wait for more user-friendly implementation for Segwith on the already known wallets in the market. You can already do it with Core but it's not that user-friendly and there is no GUI for now.

If you are looking for a wallet that already has support for Segwit, Green Bits for Android generates Segwit addresses by default[1].

[1] https://play.google.com/store/apps/details?id=com.greenaddress.greenbits_android_wallet

[Golerm]

What is the easiest way to do it?

I would recommend you to wait, till the wallets have implemented a simple method (create segwitaddress by default) for this. I think f.e. Bitcoin Core 0.15.0 will have this feature.

This would indeed be the best option. Beware of scammers, there are plenty of dubious sites crawling up right now.

[ShitTeam]

Thanks guys! I definitely don't want to trust my BTC to wallets I've never heard about

Are there some commands I can run in Bitcoin core GUI debug window to generate SegWit address?

[Emoclaw]

Thanks guys! I definitely don't want to trust my BTC to wallets I've never heard about

Are there some commands I can run in Bitcoin core GUI debug window to generate SegWit address?

From https://bitcoin.stackexchange.com/questions/57832/how-to-generate-segwit-address:

You can use addwitnessaddress addr, where addr is an existing P2PKH or P2SH address of yours. It will construct a P2SH-P2WPKH or P2SH-P2WSH address with the same key/script, if known to be valid.

[coinableS]

I know this site, but I can not say anything about trustability: https://segwitaddress.org/

This was just something I threw together over the weekend using functions from someone else's repo as stated in the heading of the site. The address functions are using bitcoinjs which is a trusted library used by GreenAddress, Blockchain.info, Blocktrail and more. There's nothing funky going on, but it's good to be skeptical of pretty much everything especially wallets in the crypto space.