Yes, so if you plan on drinking cold drinks, stick to cold cans and bottles. People who are native to the country are more used to it, but foreigners may have trouble with their water cause their bodies haven't really adapted to it.
Congrats on the approval! I myself am Vietnamese (born in US) and went there several times. Definitely make sure not to drink anything that isn’t in an unopened bottle or can and never drink with ice.
Highly recommend Mystery Fleshpit. Definitely one of the best Wendigoon deep dives
Also, aim for feet. Splash damage may not be as flashy as getting a direct hit, but actually dealing damage to an enemy is a lot better than never getting kills and always respawning. As you play more and more, you'll be able to pick up on player movements and you can more easily hit direct shots.
I used to main soldier when I started playing TF2 (now I go back and forth between Spy and Medic). Something to always keep in mind is your health when you're rocket jumping. Rockets do a significant amount of self damage and even if you're using the rocket jumper, even fall damage will add up and every time you encounter an enemy after a rocket jump, you will most likely be at a lower than ideal health. Playing soldier is a balancing act between using rockets to move around while also using them in battle (usually), so you also need to pay attention to how many rockets you are using so you are never caught in an awkward situation where you really need it.