Basically copy coupon, view price history or create e-mail price alert. Do you want to know what the best price is?
Meterial: Plastic, Name: Water Bottle, Capacity: 500ml/700ml, Height: 23cm, Color: Green /Blue, Cup mouth dia: 5.5cm, Bottom dia: 6.5cm
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($8.55): ADMITAD2212
2. ($8.64): BG00c906
put item in your cart and apply coupon code there after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGwhielabel, BG10OFFAFF1, BANGGOODSD, 6GSGIT, 00c906
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Price history and price alert
Price history (for all/most countries) for 500ml Water Bottle is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).