While adorable I’d switch to a water bowl. From what I understand their little tongues can get caught by the the ball bearing in these dispensers.
This model doesn’t tip: STAYbowl Tip-Proof Ergonomic Pet Bowl for Guinea Pig and Other Small Pets; 1/4-Cup Size; Sky Blue https://www.amazon.com/dp/B01AK5LERM/ref=cm_sw_r_cp_api_i_UKBKFbJ9V4T0V
This helped. They still cover it with bedding but it’s less mess.
STAYbowl Tip-Proof Ergonomic Pet Bowl for Guinea Pig and Other Small Pets; 1/4-Cup Size; Sky Blue https://www.amazon.com/dp/B01AK5LERM/ref=cm_sw_r_cp_api_glt_fabc_847F0BGF7XW2FYWSPMDV
I use this bowl. It comes in several colors.
Bowls for food that are designed so that piggies can step on them without tipping it over :)
I have this https://dyreverdenen.dk/pawise-melamin-skaal-med-rustfri-staal-160ml
I imagine this is good as well :) https://www.amazon.com/STAYbowl-Tip-Proof-Ergonomic-Guinea-Other/dp/B01AK5LERM